* muted-to-the-bottom POC
* split muted rooms in natural algorithm
* add previous event to account data dispatch
* add muted to notification state
* sort muted rooms to the bottom
* only split muted rooms when sorting is RECENT
* remove debugs
* use RoomNotifState better
* add default notifications test util
* test getChangedOverrideRoomPushRules
* remove file
* test roomudpate in roomliststore
* unit test ImportanceAlgorithm
* strict fixes
* test recent x importance with muted rooms
* unit test NaturalAlgorithm
* test naturalalgorithm with muted rooms
* strict fixes
* comments
* add push rules test utility
* strict fixes
* more strict
* tidy comment
* document previousevent on account data dispatch event
* simplify (?) room mute rule utilities, comments
* remove debug
