Replace SortFilterProxyModel by DelegateModel

TODO.md

@@ -5,11 +5,11 @@
 - update glass theme
 - back/front buttons in small window
 - minimum sizes
-- save/restore swipeview current rooms for accounts
 - lag when switching accounts
 - message delegate too tall
 - unread counts on accounts
 - fix compact mode
+- left rooms opacity
 
 - fix escape keybinds (filter rooms, message selection)
 - if last room event is a membership change, it won't be visible in timeline