Add back the "Add-ons" preferences, removing add-on logic from
extensions.
- Add support for filtering add-ons by tags
(separate from extension tags).
- Tags now respect the "Only Enabled" option.
- Remove the ability to enable/disable add-ons from extensions.
- Remove add-on preferences from extensions.
- Remove "Legacy" & "Core" prefix from add-on names.
- Remove "Show Legacy Add-ons" filtering option.
Implements design task #122735.
Details:
- Add-on names and descriptions are no longer translated,
since it's impractical to translate text which is mostly
maintained outside of Blender.
- Extensions names have a `[disabled]` suffix when disabled so it's
possible to identify installed but disabled extensions.
- The add-on "type" is shown in the details,
so it's possible to tell the difference between an extension,
a core add-on & a legacy user add-on.
- Icons are also used to differentiate the add-on type.
- User add-on's must be uninstalled from the add-ons section
(matching 4.1 behavior).
- Simplify logic for filtering tags, move into a function.