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/StartChatScreen/StartChatScreenViewModel.swift

@@ -153,7 +153,7 @@ class StartChatScreenViewModel: StartChatScreenViewModelType, StartChatScreenVie
     
     private func showLoadingIndicator() {
         userIndicatorController?.submitIndicator(UserIndicator(id: Self.loadingIndicatorIdentifier,
-                                                               type: .modal(interactiveDismissDisabled: true),
+                                                               type: .modal(progress: .indeterminate, interactiveDismissDisabled: true),
                                                                title: L10n.commonLoading,
                                                                persistent: true))
     }