similarify MediaDiff and PageDiff classes

move media_diff() into Ui\MediaDiff class

deprecated functions:
media_diff()
_media_file_diff()
media_file_diff()
media_image_diff()

Ui\Diff hierarchy

translation update

extension manager: fix for empty API result. fixes #3330

PHP 8: rename match() to apply() in Lexer #3298

codestyle fixes

add new log dir to test data directory

Ui\Diff hierarchy

move Ui\Diff to Ui\PageDiff

fix html missing closing div tag

UI\Revisions hierachy

define Revisions as abstract, which is inherited by PageRevision and MediaRevision classes. this is simillar to ChangeLog class hierachy.

create Ui\PageRevisions class

new Ui\PageRevisons is dedicated for page revisions

create UI\MediaRevisions class

Create new Ui\MediaRevisions class created by copying from Ui\Revisons and customize its methods to use media only (methods args are changed).
Replace deprecated html_

create UI\MediaRevisions class

Create new Ui\MediaRevisions class created by copying from Ui\Revisons and customize its methods to use media only (methods args are changed).
Replace deprecated html_revisions() with Ui\MediaRevisions->show() method.

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translation update

usermanager CLI: more cleanup

usermanager CLI: use success messages

This makes it more consistent with the other tools

usermanager CLI: fix parameter order for creating users

usermanager CLI: catch plugin signalled error messages

Plugins may prevent user modifications and will use msg() to tell why.
This will catch the messages and print them on CLI as well

abort early when no auth backend is available

type hints and cleanup

stricter user check in AbstractUserAction

set proper revinfo when media meta file is not available

MediaChangelog::getRevision() may return false when media changes meta file is missing, cause error unsupported operand types.

avoid running tests twice for pull requests

This implements the suggested method from [1]. It runs tests on all pushes to
our own repository and for pull requests coming from other people's forks.

avoid running tests twice for pull requests

This implements the suggested method from [1]. It runs tests on all pushes to
our own repository and for pull requests coming from other people's forks.

[1] https://github.community/t/how-to-trigger-an-action-on-push-or-pull-request-but-not-both/16662/10

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Replace Appveyor and Travis with Github actions

Travis has recently introduced built limits which makes using them very
slow sometimes and I never really liked the setup for appveyor for our
Windows

Replace Appveyor and Travis with Github actions

Travis has recently introduced built limits which makes using them very
slow sometimes and I never really liked the setup for appveyor for our
Windows testing.

This makes use of github actions instead. Some notes:

* since we only support PHP 7.2+ anymore, nothing below is tested
* MySQL and Postgres auth backends are only tested on Linux (as before)
* I am not actually sure the problem matchers are working as intended
* There is currently no good way to run tests that are allowed to fail
so no PHP 8 tests are run yet
* I haven't reestablished the no-gzip test runs again, I'm not sure they
are still relevant on modern PHP systems
* PHP 7.4 currently fails because of https://github.com/MarcusSchwarz/lesserphp/pull/18
* I'm currently using @v2 tags for the used action. We had a discussion
before if we should actually pin the action to a fixed commit. For
sake of easier maintainance, I would argue to trust the setup-php
action.

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