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/Resources/Localizations/en.lproj/Localizable.strings

@@ -14,6 +14,7 @@
 "action_continue" = "Continue";
 "action_copy" = "Copy";
 "action_copy_link" = "Copy link";
+"action_copy_link_to_message" = "Copy link to message";
 "action_create" = "Create";
 "action_create_a_room" = "Create a room";
 "action_decline" = "Decline";
@@ -109,6 +110,7 @@
 "common_sticker" = "Sticker";
 "common_success" = "Success";
 "common_suggestions" = "Suggestions";
+"common_syncing" = "Syncing";
 "common_third_party_notices" = "Third-party notices";
 "common_topic" = "Topic";
 "common_topic_placeholder" = "What is this room about?";