App Polish (#1098)

* App polish

- Skeleton avatar colour on app switching.
- Bug report icon and string.
- Semi-bold font on room list timestamps.
- Room attachments button spacing and alignment.
- Replace link tint with semi-bold font in AnalyticsSettingsScreen.
- Semi-bold font on Invites button.
- Add padding to media attachment sheet.
- Message composer header layout tweaks.
- Remove indicator after changing homeserver with an MXID.
- Change copy permalink string.
- Formatting of link in Analytics Prompt.
- Remove indicator after changing homeserver with an MXID.
- Change copy permalink string.
- Formatting of link in Analytics Prompt.
- Only semi-bold the room timestamp when unread.
- Tweak the colour of the date separator.
- Add activity indicator to toast style user indicator.

ElementX/Sources/Screens/RoomScreen/RoomScreenViewModel.swift

@@ -519,7 +519,7 @@ class RoomScreenViewModel: RoomScreenViewModelType, RoomScreenViewModelProtocol
 
     private func showLoadingIndicator(with delay: Duration) -> Task<Void, Never> {
         userIndicatorController.submitIndicator(UserIndicator(id: Self.loadingIndicatorIdentifier,
-                                                              type: .modal(interactiveDismissDisabled: true),
+                                                              type: .modal(progress: .indeterminate, interactiveDismissDisabled: true),
                                                               title: L10n.commonLoading,
                                                               persistent: true),
                                                 delay: delay)