* update to Api 33, fix some deprecations
* fix deprecated serializable/parcelable methods
* ask for notification permission
* fix code formatting
* add back comment in PreferencesActivity
* Preference to disable multiple-login usernames (with problems)
* Fix problem where 'show self username disambiguation' does not take effect immediately because MainActivity needed to be restarted
* Make 'show username in toolbars' a 3-option selector, default when multiple accounts logged in
* Move SHOW_SELF_USERNAME higher in preference fragment
* convert EmojiPreference and EmojiCompatFont to Kotlin
* move preference related to to dedicated preference package
* update proguard-rules.pro
* reformat & add comment
* maintain disposable information in EmojiPreference instead of EmojiCompatFont