Support Anki 2.1.x

same problem as https://github.com/glutanimate/anki-addons-misc/issues/38
code taken from fix glutanimate/anki-addons-misc@b68b8cb
fixes glutanimate#46

Fix encoding error in pathname2url on python3

)

Fixes glutanimate#60

This is necessary for changes to image files to become visible in
the EditCurrent and Browser editor instances.

Fixes glutanimate#62

Allows us to experiment with different svg-edit versions

This implements a new method which grants us the limited possibility
of performing in-place changes to the card template without discarding
any potential changes that the user might have performed.

Up to this point the add-on config/templates would only be set up
upon user interaction (e.g. creating new I/O notes or changing options).
This commit will allows us to update the note type before a user has
the chance to interact with potentially outdated notes/cards.

(of importance for instance with the switch to Anki 2.1, where
updates to the card templates are needed for the cards to render
correctly in the Reviewer)

Fixes glutanimate#45. Most likely also fixes glutanimate#15.

Even with a liberal fadein timer set, the image flashing problem
would still persist on slower systems and/or systems that have
performance issues with the new web engine (macOS?).
Postponing image visibility until after the mask is loaded
seems like the only surefire way to prevent instances of the answers
flashing before the actual answer reveal.

We still use a small aFade timer to make transitions between question
and answer where the images have not been cached smoother.

Because this change comes with a lot of increased complexity to the
basic method of operation of the add-on, and because it has the potential
to completely disrupt card reviewing, it will require extensive
testing across all platforms (especially the mobile clients and
AnkiWeb).

Now that we only have two modes left, it makes sense to explore more
intuitive labels that are still close enough to the previous ones
to not confuse existing users. (thanks to tmbb for the suggestion!)

Closes glutanimate#50

… set parent.

Fixes glutanimate#65

Might be worthwhile to look into using Anki's own dialog manager
for I/O editor instances at some point.

By delaying web view rendering until SVG-Edit is fully up and running,
we eliminate most of the perceived glitchiness on Anki 2.1 (glutanimate#55.)

Switching to a multi-instance model has been long overdue. Aside from
contributing to the fix for image flashing regression (glutanimate#55), it will
likely also address a number of longstanding problems that users
experienced after longer I/O sessions (SVG-Edit malfunctioning, or
stopping to work entirely after too many image changes).

Previous attempts at refactoring the add-on in a similar way had failed
because of issues with memory management (6d222df). This commit finally
introduces proper clean up and garbage collection which surprisingly
seems to work perfectly in QtWebEngine as opposed to QtWebKit
(though I might have just learned how to handle objects in Python
a bit better since my last attempt 2 years ago)

With fitImageCanvas now using a JS timer, automatically fitting images
to the canvas finally works.

Fixes glutanimate#71

os.startfile is complaining about missing file associations, even though
they appear to be set.

This partially resolves glutanimate#76. Seems like this change has no noticeable
ill effects on memory management.

fixes glutanimate#87

2.1's Python dist no longer ships with uuid
(partially reverts 5908e13)

Anki now ships uuid again.

Seems like packaging uuid locally might have also caused some
problems on macOS. Hopefully this fixes those.

Don't try to reload ed.web whent it's None.

cf.: https://reddit.com/r/Anki/comments/bbho7d/image_occlusion_crash_since_anki_updates/

Add option to save clipboard images as png.

We were shipping a non-working version of PIL anyway that had been
mangled in the 2to3 conversion step last year

Due to the extension restrictions in the file selector dialog,
imageProp almost never had to fall back to PIL, and so this issue
remained undiscovered until now

thanks to Audrey for inspiring this change

Fixes TypeError when updating template (thanks to Emma for the report)

This fixes the issue by calling leaveContext() before the calls
to svgCanvasToString(). leaveContext() returns from a group context
to the normal one.

This fixes issue glutanimate#123

- Surround (most) translatable Strings with 'gettext' calls
- Change format Strings
- Remove '_cardS()'
* Kept most translations from 'main.py'
+ Add 'lang.py'
+ Add skeleton file, generated by `xgettext`

+ Add complete German translation

* Fix missing ‘>’ in 'dialogs.py' (“<b>Fixing a broken note type:</b\n”)

* Move 'src/image_occlusion_enhanced/locale/de/LC_MESSAGES/anki-image-occlusion-enhanced.po'
  to   'src/image_occlusion_enhanced/locale/anki-image-occlusion-enhanced.pot'
* Change file paths in comments of po(t) files

* Only use local variables because the multi threading
  is only really useful for Anki
* Update the modification comment

Thanks to @BlueGreenMagick for the pointer!

Fixes glutanimate#137

Use double quotes in queries and don't quote the field name individually

Change config access

Revert "Change config access"

…on-enhanced

Fix version number

…-crash

Fix issue glutanimate#95 (crash in in-group editing mode)

Change how clipboard images are saved.

DONE:

+ profile_did_open
+ editor_did_init_buttons
+ editor_will_show_context_menu (fixes glutanimate#151)

TODO:

+ Editor.setNote
+ Reviewer._showAnswer
+ reviewStateShortcuts
+ browser.setupMenus
+ unloadProfile

…tent