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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Fix groups match in auth_ismanager and auth_isadmin

Even if a user was passed to the check but no groups, current user's groups were used for the match

Add IPv6 unit tests

refactor page and media resolving, introduce ~ shortcut

This moves the resolve_id() type of functions into their own class
hierarchy.

A new shortcut to be used in links is introduced. The tilde ~ c

refactor page and media resolving, introduce ~ shortcut

This moves the resolve_id() type of functions into their own class
hierarchy.

A new shortcut to be used in links is introduced. The tilde ~ can be
used to reference the current page as a namespace. This is useful to
dynamically create a new namespace from an existing page, effectively
making that page the start page. It allows for a more dynamic growth of
the wiki and makes use of the rarer used "startpage named like the
namespace" method for start pages.

The existing code has not been modified, yet and continues to use the
old, now deprecated methods. Some tests are still failing - before they
are fixed, the expected behaviour needs to be discussed.

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Thorough tests for EO, DE, PT and ES

Correction for German collation; examples for German and Spanish; much better comments

Tests for Portuguese and Spanish

Collations for Portuguese and Spanish; examples for Portuguese; better comments

Changes according to revisions in https://github.com/moisesbr-dw/dokuwiki/pull/2

Many minor details and use of Sort::xyz() instead of intl_xyz() in files outside the "inc" folder.

fixed tests for cleanID and romanization for Greeklish

test the collator fallback always

Now the use of the intl extension can be turned off, allowing for easy
testing of the fallback. The test now inherits from the collator test so
we avoid too much du

test the collator fallback always

Now the use of the intl extension can be turned off, allowing for easy
testing of the fallback. The test now inherits from the collator test so
we avoid too much duplicate code

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cleanup for collator tests

The proper use of data providers now make it much easier to add
addtional languages to the test

wrap sorting functions into their own class

adjust handling for greek characters. fixes #3188

This fixes an error in the case conversion table and removes "normal"
greek letters from the list of special characters. Mathematical symbols
based

adjust handling for greek characters. fixes #3188

This fixes an error in the case conversion table and removes "normal"
greek letters from the list of special characters. Mathematical symbols
based on greek letters are still considered special chars.

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skip redirect tests while httpbin is broken #3187

Until https://github.com/postmanlabs/httpbin/issues/617 is fixed or we
found an alternative, the redirect tests will be skipped.

use envvars in shebang

add unit tests for #3114

Changes to conform to PHP Code Style

New function lang_has_changed() as wrapper for _get_collator(TRUE).

Collator re-creation in unit test

fix the case lookup table. #3113

This readds a whole bunch of conversions that for some reason got lost
in the refactoring. No idea what happened there.

run all tests without mbstring support

The setup we had, where we tried to disable mbstring on a perclass basis
did not actually work because the define is set up in an early include
already.

Ideal

run all tests without mbstring support

The setup we had, where we tried to disable mbstring on a perclass basis
did not actually work because the define is set up in an early include
already.

Ideally we should probably make the check a static instead of a
constant.

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Documentation update

Minor changes.

Test class for sort without collator

Test class for sort with collator

fix tests for cached isAdmin/isManager

more tests and a fix for #3036

Exploding lines left dangling commas for the addresses. In addition the
$text variable was not reset properly later on leading to an additional
error.

added failing test for #3036