initialize remote data in one go

Previously each extension was fetched separately from the API, this
fetches all installed ones in one go, speeding up the first open on cold
cache significantly.

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: (automatic) code style fixes

Extension Manager: check repo access in handle()

Still need to check if the behaviour on missing internet works okay.

Extension Manager: by default skip all git controlled extensions

Extension Manager: First go at reimplementing the GUI

still a long road ahead

Extension Manager: CLI now should completely use new classes

Extension Manager: make installation work again

The Installer class now also handles dependencies

Extension Manager: list warnings on CLI

Extension Manager: more refactoring

started to migrate the CLI over to the new classes

�� Rector and PHPCS fixes

code style: line breaks

coding style: function call spacing

Apply rector renames

Apply rector fixes to the rest of lib/plugin

Apply rector fixes to extension plugin

adjust help text of extension cli

to reflect that extensions can be installed from URLs as well

Do not duplicate the foreach ($installed...

Allow installing extenions from URL via the CLI

fixes #3258

extension cli: do not try to upgrade bundled plugins

fixes #3227

fixed bug in extension cli when installing multiple plugins

added filter to extension listing in CLI component

fix color for noninstalled extensions

show disabled extensions in gray

warn about inaccessible repo api