Use str_starts_with/str_ends_with

Apply rector fixes to inc/Ui

minor SVG improvements

* never try to use slika to resize SVGs - let the browser do it
* use object-fit:cover for all images - this properly crops inside the
browser if the backend didn't (like fo

minor SVG improvements

* never try to use slika to resize SVGs - let the browser do it
* use object-fit:cover for all images - this properly crops inside the
browser if the backend didn't (like for SVGs). currently dokuwiki
template only - might be worth moving to default styles
* show previews for SVGs in media manager

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rename namespace Media to File

This is a bit more generic and allows us to have additional File
abstractions in here later.

readded $jump mechanism, removed unused functions

fix entity definition

reenable the option to display a relative namespace for media files

This is used when searching for media files

make use of the new media file classes

This just crudely replaces the calls to the old functions with usage of
the new classes. This however already works and makes (manual) testing
of these classes

make use of the new media file classes

This just crudely replaces the calls to the old functions with usage of
the new classes. This however already works and makes (manual) testing
of these classes easier.

Next steps: remove the old media_printfile and media_printfile_thumbs
methods and fix/drop/replace the tests depending on them. search_media
might be obsolete, too already.

For search results the display classes need to show full namespaces.
This needs to be fixed again. No idea about the jump mechanism, yet.

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first go a refactoring the media manager

For now this only adds code. This takes care of encapsulating media file
information and has some UI classes to display those files in the
fullscreen media m

first go a refactoring the media manager

For now this only adds code. This takes care of encapsulating media file
information and has some UI classes to display those files in the
fullscreen media manager and the popup.

The code is untested and not integrated to run, yet. Next step is to
replace the parts in the media manager to call this new code (and fix
any bugs).

I tried not to change much HTML yet. This can be done later. For now the
goal is to just make it run again.

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