- admin flag exposed to qml for chat/channel
- `CreateChannelPopup` updated
- `createPopup` function added to the `Global` singleton
- `PinnedMessagesPopup` component moved to `AppMain` and shared
among components beneath
- `chatType` added to `Constants` to group chat type related values
- `messageContentType` added to `Constants` to group message content type related
values
- `MessageStore` maintained per message list now
- added new `ChatContentView` component used to display chat/channel content
- components updated to display messages from the new backend
- `StatusChatToolBar` appropriately updated
- mute/unmute feature added to chat/channel list as well as to `StatusChatToolBar`