Simplified kdesk sound code, adding mouse device for Kano keyboard

 * We are delegating sounds play to kano-sound-cli
 * Removed all mp3 decompression and libraries
 * Added a new device to listen for mouse events during screen saver
Fixed bug listening input events for new mouse device (screen saver)
Merge pull request #59 from KanoComputing/sound-cli

Simplified kdesk sound code, adding mouse device for Kano keyboard