* 3204: Add an account based preference store
* 3204: (related) reformat a bit, add todo
* 3204: Use the preference data store for all three account settings
* 3204: Move event handling to account settings handler
* 3204: Correct includes
* 3204: Appease linter
* 3204: Appease linter again
* 3204: Add an account based preference store
* 3204: Use the preference data store for all three account settings
* 3204: Move event handling to account settings handler
* 3204: Correct includes
* 3204: Add general "preference upgrade loop stepper"; use it for removing obsolete account settings (in shared)
* 3204: Add missing spaces
* 3204: Key is non-nullable
* 3204: Upgrade to new settings migration code
* 3204: Remove (commented) DI code