…ched anymore) (#5879)

* Fixes #5861
Description:
- Cleanup entries: "Make paths of linked files relative (if possible)" broke web URLs and resulted in various other issues subsequently. This PR fixes this issue.
It has been tested for local files and web urls.

* changelog updated

* refactoring: use existing method isOnlineLink() for checking whether a file link is an online link; improving isOnlineLink()

As the current link just pointed to a page with another link, I'd propose to directly put that second link.

* upstream/master:
  Replace link to Workspace set-up with new one (#5896)
  Fixes making paths of linked files relative (web urls will not be touched anymore) (#5879)

* upstream/master:
  reference to issue added (#5911)
  Fix properly resolves OrFields of required fields (#5903)
  IDE setup updated and extended (#5901)
  Squashed 'src/main/resources/csl-styles/' changes from e71363e..c531528
  Fixes problems with managing external file types (issue 5846) (#5894)
  Squashed 'src/main/resources/csl-locales/' changes from 41da445acc..4fa753374e
  Squashed 'src/main/resources/csl-styles/' changes from f0c7374..e71363e
  Update development-strategy.md

* upstream/master:
  Update JDK14 from EA 30 to EA 34 (#5910)
  ide-setup updated (#5915)
  Added update method to typePropertyListeners (#5917)
  Bump mariadb-java-client from 2.5.3 to 2.5.4 (#5914)
  Bump org.beryx.jlink from 2.17.0 to 2.17.1 (#5913)

* upstream/master:
  Update to jdk 13.0.2 (#5924)
  Update Eclipse config
  Update open OpenOfficePanel to show buttons in three rows of three. (#5789)
  update to javafx 13.02 (#5921)

* upstream/master:
  Bump unirest-java from 3.4.01 to 3.4.03 (#5932)
  Bump postgresql from 42.2.9 to 42.2.10 (#5930)
  Bump archunit-junit5-api from 0.13.0 to 0.13.1 (#5928)
  Bump classgraph from 4.8.60 to 4.8.62 (#5927)
  Bump commons-csv from 1.7 to 1.8 (#5929)
  Bump jsoup from 1.12.1 to 1.12.2 (#5931)
  Disable search when no library is opened (#5923)
  Fix maintable not updated when changing entry type (#5925)

* upstream/master:
  Fix invalid filename with curly braces and fix wrong encoding in parser (#5926)

* upstream/master:
  Fix #5939 by creating a mutable list in OpenDatabaseAction (#5940)

* upstream/master:
  Bump classgraph from 4.8.62 to 4.8.64 (#5954)
  Squashed 'src/main/resources/csl-styles/' changes from c531528..9e81857
  Fix not escaping special characters in search pattern (#5938)
  fix missing gson

* upstream/master:
  Try to fix linux pdf opening again (#5945)
  [WIP] Initial work on DBMSProcessor batch entry insertion into ENTRY table (#5814)
  followup fix
  Fixfetcher (#5948)
  Bump byte-buddy-parent from 1.10.7 to 1.10.8 (#5952)
  Added MenuButtons to IntegrityCheckDialog (#5955)
  Reimplement custom entry types dialog (#5799)
  Bump unirest-java from 3.4.03 to 3.5.00 (#5953)
  MySQL: Allow public key retrieval (#5909)
  Restructure and improve docs for setting up IntelliJ (#5960)
  Change syntax for Oracle multi-row insert SQL statement (#5837)

* upstream/master:
  Add option to parse new references from plain text using GROBID… (#5614)
  update jlink plugin and gradle to 6.2 (#5964)
  Remove background command line window (#5965)

* upstream/master: (21 commits)
  Update module description (#5999)
  New Crowdin translations (#5990)
  Fix NPE in OpenAccessDoi (#5994)
  Move generate BibTeX keys to Edit menu (#5987)
  Fixed display of groups and links column in MainTable (#5985)
  Fixed loosing group if the most bottom one in list is dragged on itself (#5983)
  Dividers (#5975)
  Add initial section on code quality (#5991)
  Create .sonarcloud.properties
  Add new IntelliJ video tutorial to docs. (#5984)
  Fix checkstyle
  Optimize stream() code
  Use application/x-bibtex for Grobid instance
  New Crowdin translations (#5971)
  Set BibEntry to "changed" state before setting a new entry type (#5966)
  Rework tools menu (#5979)
  Help menu (#5976)
  Fixed formatting
  Refactored subtile changes to optics of library properties (#5969)
  Change grobid URL to jabref subdomain (#5972)
  ...

* upstream/master:
  Fix teamscale link - and sort list alphabetically
  Update code-quality.md
  Update link to codacy/JabRef
  Integrate gradle validation in normal test workflow (#6001)
  Fixed group drag-n-drop not working after inserting an article into a group (#6008)
  New Crowdin translations (#5998)
  Bump richtextfx from 0.10.3 to 0.10.4 (#6007)
  Bump unirest-java from 3.5.00 to 3.6.00 (#6006)
  Bump com.github.ben-manes.versions from 0.27.0 to 0.28.0 (#6004)
  Bump classgraph from 4.8.64 to 4.8.65 (#6003)
  Bump mockito-core from 3.2.4 to 3.3.0 (#6005)

* upstream/master:
  New Crowdin translations (#6028)
  Squashed 'src/main/resources/csl-locales/' changes from 4fa753374e..d73af4a3fe
  Squashed 'src/main/resources/csl-styles/' changes from 9e81857..f03dece
  Add deep link to uni Basel
  Refine information on codacy
  New Crowdin translations (#6020)
  Fix l10n
  New Crowdin translations (#6016)
  Update CleanupUrlFormatter.java
  Update URLUtil.java
  Fix modernizer warnings
  Remove unused error prone
  Use Java version class
  Remove commented out code
  Upgrade deprecated gradle API
  Add plugin scope
  New menu "Lookup"
  Fix casing of "LaTeX" --> either "Latex" (code) or "LaTeX" (code comments, user-facing)

* upstream/master:
  Remove "Merge Entries" from Quality Menu (#6021)
  Raise codecov threshold (#6027)
  Translation for SpecialField names in preferences (#6031)
  Fix dependency updates workflow (#6033)
  Add graal info to module file (#6010)
  Group remote database actions in menu
  Move journal abbreviations to quality

* upstream/master:
  Update year
  Fix fetcher tests using correct month (#6050)
  New Crowdin translations (#6047)
  Squashed 'src/main/resources/csl-locales/' changes from d73af4a3fe..2b94bf9fac
  Squashed 'src/main/resources/csl-styles/' changes from f03dece..566df87
  Rephrase IntelliJ paragraph
  Update gradle from 6.2 to 6.2.1 (#6048)
  New Crowdin translations (#6040)

* upstream/master:
  Bump jsoup from 1.12.2 to 1.13.1 (#6052)
  Bump checkstyle from 8.29 to 8.30 (#6051)

* upstream/master:
  snap: fix for native-messaging-host permissions (#6062)
  Refine list of external libraries
  Update JDK14 from 34 to Build 36 (2020/2/6) - Release Candidate
  Also release a binary in the "master-release" branch (which is to test releases)
  Refine CHANGELOG.md (markdown-lint)
  Add authors
  Add authors of 5fa1dcf
  New Crowdin translations (#6059)
  Lint README.md
  Squashed 'src/main/resources/csl-styles/' changes from 1ab0241..265a3a9
  JournalList: Minor corrections (#6043)
  Squashed 'src/main/resources/csl-styles/' changes from 566df87..1ab0241
  Add use statement for mariadb.

* upstream/master:
  Move snap publishing to own workflow
  Squashed 'src/main/resources/csl-locales/' changes from 2b94bf9fac..d0ee4d13c9
  Remove obsolete step
  Add debug output for snap file location
  Try to build snapcraft image also on master-release
  Build snap only for master branch
  Update GitVersion action from v0.3 to v0.9.1 (#6061)
  Add empty line to deployment.yml to trigger build
  Release v5.0
  Refine external-libraries.txt
  Revert "Remove ci prefix for releases"
  Remove suffix "-ci.1" from version information stored in BuildInfo
  Remove ci prefix for releases
  Use github action to publish snap

* upstream/master:
  Squashed 'src/main/resources/csl-styles/' changes from 265a3a9..6d7ca0a
  Trigger build
  Fix release date
  Explicitly list more external libraries
  Ignore extracted JDK 14
  Revert "Update JDK14 from 34 to Build 36 (2020/2/6) - Release Candidate"
  Disable codecov comments
  Updated screenshot and added hint on the FAQ (#6058)
  Readd package portable
  Add debug output