Major overdue cleanup of todo.md.
Major overdue cleanup of todo.md.

ProtonMail/ui,beni55/ui,HunterChen/ui,janstk/ui,292388900/ui,cainiaocome/ui,HunterChen/ui,robbiev/ui,robbiev/ui,cainiaocome/ui,mirrr/ui,hajimehoshi/ui,janstk/ui,hajimehoshi/ui,UIKit0/ui,UIKit0/ui,292388900/ui,hajimehoshi/ui,robbiev/ui,ProtonMail/ui,mirrr/ui,cainiaocome/ui,HunterChen/ui,beni55/ui,UIKit0/ui,janstk/ui,mirrr/ui,292388900/ui,beni55/ui,ProtonMail/ui