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/RoomScreenViewModel.swift

@@ -45,6 +45,7 @@ class RoomScreenViewModel: RoomScreenViewModelType, RoomScreenViewModelProtocol
                                                          roomAvatarURL: roomProxy.avatarURL,
                                                          timelineStyle: ServiceLocator.shared.settings.timelineStyle,
                                                          readReceiptsEnabled: ServiceLocator.shared.settings.readReceiptsEnabled,
+                                                         isEncryptedOneToOneRoom: roomProxy.isEncryptedOneToOneRoom,
                                                          bindings: .init(composerText: "", composerFocused: false)),
                    imageProvider: mediaProvider)