App polish part 2 (#1118)

- Fix sheet backgrounds in dark mode.
- Fix background colours for reaction buttons.
- Reply view layout.
- Update separator colours.
- Don't show sender name/avatar in DMs.
- Fix inconsistent line heights with formatted body text.
- Use plain text for reply
- Increase tappable size of collapsed state changes button.
- Blockquote layout and text colour.
- Tap to expand the topic in room details.
- Change the topic and security font size in room details.
- Add cancel button when inviting someone to an existing room.
- Reword Add Friends to Add People in start chat screen.
- Update compound.

ElementX/Sources/Screens/RoomScreen/RoomScreenModels.swift

@@ -86,6 +86,7 @@ struct RoomScreenViewState: BindableState {
     var showLoading = false
     var timelineStyle: TimelineStyle
     var readReceiptsEnabled: Bool
+    var isEncryptedOneToOneRoom = false
     
     var bindings: RoomScreenViewStateBindings