Added Thumbnail Support to MediaLib, LibViewItem and PlaylistView
Added *Thumnail support in metadata and playlists*
Added *Library Refresh animation*
Added *Lot of icons*
Modified *Library refresh won't block Gui anymore*
Modified *Connect / Disconnect only one is enabled depending on the connection state*
Modified *Base64 repair function improofed/corrected*
Tweaked *Heaviely improofed speed of CasparCGConnection.sendCommand thru better response receiving strategie and end-of-message detection*
Modified *little code clean up on parts that got way to messie ;-)*