Initial working app

Added/corrected support for querying server.
Implemented callbacks to update status in Fragment
Added menu button for connecting/disconnecting from server (AV receiver)
Added Volume support

Added dedicated mute/unmute toggle button.
Added dedicated volume slider.
Removed some un-used code from eiscp.java (command-line support).
Optimized 'padding' insertion in Packet generation
Changed volume_ variable from int to float, to potentially support those
devices which only have 0-80 volume settings. This is to allow API to
outside logic to always be base-100.