Periodical maintenance release

• Cleanup of QML code
• Improved the length of text fields to display as much content as possible (overlong group names etc.)
• Workaround for Telegram servers sending message IDs from higher APIs than we support (2 cases)
• Startup: If code authentication was interrupted, only a white screen came up. Should be fixed
• Secret chats no longer crash when receiving media. Unfortunately they also dont show them ;)
• Changed the indication of no network and no server connection from the title text override to a nice cloud symbol
• Attachment panel rework: Uses stock icons now, and Ubuntu colors. Yes we are not Android ;)