Core revamp part 2

[prasannavl]

Description

• Depend on tide-core for tide-log instead of full tide
• DefaultHeaders to new crate tide-headers
  • Add trace
  • Remove inline attr that's counter intuitive.
• RootLogger -> RequestLogger in new crate tide-slog
  • Minor refactors
  • Add with_logger constructor
  • Make behaviour consistent with tide-log
• tide-log
  • Add with_target constructor to configure log target
  • Make default target as requests
• [BREAKING] Make RequestLogger from tide be exposed from tide::middleware
• [BREAKING] Remove tide-slog based logger from tide::middleware.

Other

• Add examples: hello_envlog, hello_logrs
• Add tide as dev-dependency to all crates, since they'll all require documentation at some point
• Minor additional documentation throughout touched surface

Additional PRs left:

TODO - Core revamp - Part 3

• Extract form.rs into tide-forms
• Extract querystring.rs into tide-querystring

TODO - Core revamp - Part 4

• Move non essentials from tide-core into tide

Motivation and Context

#162

How Has This Been Tested?

All tests passed

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Refactor

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[Nemo157]

The actual revamp LGTM, probably my comment on tide-slog would be better as a separate issue.

[yoshuawuyts]

Looks great!

[fairingrey]

LGTM! Will merge after checks finish.

[prasannavl]

Thanks @fairingrey for fixing up the names.

Part 3 sitting in here, though not ready yet: https://github.com/rustasync/tide/compare/master...prasannavl:core_revamp_3?expand=1

(Have the macro bit to resolve. Should be able to make some time a little later tonight)