Fixes #9065

set_urgent is deprecated in favor of set_priority

Fixes #9101

Fixes #9094

‎* rename the remove_plugin function to uninstall_plugin because it
deletes files on the disc and uninstall is the label of the button which
triggers this function
* added a new remove_plugin function, which deactivates the plugin (if
needed), removes it from the list of managed plugins and deletes the
contents of sys.modules

This lets us now import the app module without setting paths

Remove as much as possible startup code from GtkApplication to stay
more true to our goal to separate GUI from the rest of Gajim

- Move everything translation related from gajim.py to i18n.py

Pass args to logging method instead of string formatting

This allows us to import the app module without triggering
dependency detection

Also add is_installed() for checking if a dependency is installed and
disable_dependency() in case we dont want to use a dependency

- Move database migration to the logger module
- Dont depend on Gajim version for migration use PRAGMA user_version
- Refactoring of some methods in the logger module
- Dont use cursor object, if there is no reason
- Make some attributes and methods private

LOG_DB_FOLDER and CACHE_DB_FOLDER are equal to MY_DATA and MY_CACHE

- Remove old config dir migration
- Remove some unused config paths
- Rewrite configpaths.init()
- Simplify creating paths in check_paths

- init configpaths earlier so logging can access it to store debug logs
- First step for more consistency across Gajim when looking up paths

  Recommended usage for the future:
  app.configpaths.get()
  configpaths.get()

- Groupchats promote a vcard hash with presence

Refactoring:

- Dont delete groupchat contacts if they are maximized from the roster
- Roster and GroupchatControl use the same contact object