Point release (Bugfix)

• Channels do not show an empty avatar
• Channels where a user has readonly privileges show now just a mute button like official App
• Loading of messages and dialogs should be faster due to adding missing indexes in the Db
• Small overhaul of UX and design
• Colors instead of checkmarks for the message status: grey = pending to be sent, blue = sent, green = read
• Notifications in channels and for stickers are now correctly handled and show up
• Notifications are removed from the notification area if read on another device (Thanks Telegram guys, this required no code change on out side ;))
• Channel views: Pretty-print for thousands and millions of impressions ;)