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: some more work on styling

Extension Manager: by default skip all git controlled extensions

Extension Manager: overhauled list display style

The GUI is still not fully functional again.

Extension Manager: some first attempts at styling

I'm not really happy yet, but it will be improved in coming commits

Extension Manager: First go at reimplementing the GUI

still a long road ahead

Extension Manager: ensure php requirements before installing

This makes use of the new minphp and maxphp fields in the info.txt

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

ExtensionManager: allow initialization using an ID only

This is a more convenient method

First start at refactoring the extension manager

The aim is to readd the existing functionality into proper classes, then
extend from there.

Preventing auto-filling of passwords in config #4362

We previously had set autocomplete="off" on password fields, but
browsers seem to ignore that now.

MDN suggests [1] to use autocomplete="new-pas

Preventing auto-filling of passwords in config #4362

We previously had set autocomplete="off" on password fields, but
browsers seem to ignore that now.

MDN suggests [1] to use autocomplete="new-password", so that's what's
used now. In addition autocomplete="off" is set on the form as a whole.

Will that fix the issue once and for all? Doubtful:

> This attribute is a hint to browsers; some may not comply with it.

[1] https://developer.mozilla.org/en-US/docs/Web/Security/Practical_implementation_guides/Turning_off_form_autocompletion

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fix deprecated phpunit call in styling plugin

fix expected exception message in config plugin test

user manager: explicitly set CSV parameters

This is needed since PHP 8.4

replace deprecated phpunit assertions

register linkwizard in window

This fixes a backwards compatibility issue with the changes made in
PR #4329. Plugins rely on the wizard being a globally registered object.

replace deprecated utf8_encode #4354

Fix PHP error while saving Aichat settings

translation update

LinkWizard: fix multilevel parents in references

use relative links in LinkWizard

When the linked page has a common prefix with the current page,
construct a relative link instead of always inserting absolute links.

LinkWizard: add method to create a relative link

This is not used, yet. Usage will be added in a future commit.

Since we don't have a proper testing framework in place, yet. Tests have
been added a

LinkWizard: add method to create a relative link

This is not used, yet. Usage will be added in a future commit.

Since we don't have a proper testing framework in place, yet. Tests have
been added as a standalone script that can be run manually.

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