feat: make auth salt static in test environments

Remove installer conf/dokuwiki.php hash check

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Translation update (pl)

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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

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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The data for the section edit button is now passed as an assoziative array which is
encoded in the '#<!-- EDIT(.*) -->#' placeholder as an JSON array.

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When a server has no PHP support enabled, it will either prompt to
download a PHP file or may display it as HTML instead. When a user tries
to run install.php with a server that does the latter, they will see
some weird garbage with the browser trying to interpret raw PHP as HTML.
This pathc adds a warning at the top, telling the user what is going on.

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Translation update (sl)