Moved mvcp server type to config.json

Signed-off-by: Juan Martin Runge <jmrunge@gmail.com>
Cleaned up playPlaylist method

Signed-off-by: Juan Martin Runge <jmrunge@gmail.com>
Added error handling to getServerStatus and getServerPlaylist invocations

Signed-off-by: Juan Martin Runge <jmrunge@gmail.com>