Implemented files upload facility.
Added remote files deletion facility.
Added server remove confirmation.
Added channel removing facility. Channel properties editing bound to the long click on an item.
Fixed channels and users state changes display.
Make TTS to start and stop appropriately.
Warn about stopping active transfers when switching a channel or
leaving a server.
Keep active file transfers data in the TeamTalk service to prevent
losing of information when activity is relaunched. Some other file
transfer related fixes.
Show remote file owners. A bit smaller text size for file names.
Disabled those channel item related buttons that may cause an
incorrect action.
Better general server info display.