PWA manifest and new @ini_theme_color replacement

feat: make auth salt static in test environments

Remove installer conf/dokuwiki.php hash check

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This check was useful in ages past, when there was no conf/local.php

However, nowadays it causes the installer to fail with the snapshot
version of DokuWiki and since we now have a dedicated local.php, it has
become obsolete.

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As pointed out by @klap-in, an empty string may evaluate to false in
some circumstances. This is something we may not want. Using a string
like 'test' should therefore be more robust.

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Add return flags to breadcrumbs and you are here to allow later processing

This isn't really the best place for that error handling.

Since StyleUtils has a namespace, it is already handled correctly by the
autoloader. This is further underlined by the fact that the removed line
isn't actually working because of the missing `s` in the classname.

This color is for example shown in Chrome on Android as menu-bar
coloring.

Defining SVG both as 17x17 and 512x512 is intended to support custom
splash screens, though the documentation is somewhat unclear. This
currently satisfies the Google Lighthouse auditing tool.

Local Drafts: show diff instead off full text

Changes cursor position to end of inserted image syntax, implements #2079 

Refactored section edit

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Remove createMock* polyfill for PHPUnit to let PHP 7.2 tests run

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try to display an error when installer is run without php

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