extension: don't crash on malformed conflict/dependency ids

The conflicts and depends fields in the repository metadata are free
form text entered by extension authors and may contain values that ar

extension: don't crash on malformed conflict/dependency ids

The conflicts and depends fields in the repository metadata are free
form text entered by extension authors and may contain values that are
not valid extension ids, such as "sprintdoc template". Since 9af82229f
routed every Extension construction through the strict setBase()
validation, such a value made Extension::createFromId() throw an
uncaught RuntimeException while building the notices, taking down the
whole extension manager.

Skip entries that cannot be parsed into an extension id when checking
for missing dependencies and conflicts.

As an immeadiate fix this will also be fixed in the repository API to
avoid sending invalid extension IDs to the extension manager.

Fixes #4691

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Extension Manager: use characters for messages

As pointed out in
https://github.com/dokuwiki/dokuwiki/pull/4358#issuecomment-2528848505
using Unicode Symbols for message status might not be ideal. T

Extension Manager: use characters for messages

As pointed out in
https://github.com/dokuwiki/dokuwiki/pull/4358#issuecomment-2528848505
using Unicode Symbols for message status might not be ideal. This patch
uses upper case letters instead and SVGs in the GUI manager.

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Extension Manager: adjust notice strings

Because notices are shown on command line as well as in the admin GUI,
we can not use HTML in them. This adjusts the affected language strings
and removes th

Extension Manager: adjust notice strings

Because notices are shown on command line as well as in the admin GUI,
we can not use HTML in them. This adjusts the affected language strings
and removes the previously used clean up routine.

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Extension Manager: show updatemessage for installed extensions only

Extension Manager: (automatic) code style fixes

Extension Manager: updated tests

Extension Manager: add installer to GUI

Now the GUI uses the new Installer class. More work has been done on
the GUI itself

Extension Manager: overhauled list display style

The GUI is still not fully functional again.

Extension Manager: First go at reimplementing the GUI

still a long road ahead