Added Doxygen documentation to the Audio class driver. Added new modules for each of the new device class drivers to the library documentation.

Commit of new class abstraction APIs for all device demos other than the MIDI demo - not documented yet.

Removed scheduler and memory allocation libraries.

Added new EVENT_USB_StartOfFrame event in the library to indicate the start of each USB frame (when generated).

Removed Tx interrupt from the USBtoSerial demo; now sends characters via polling to ensure more time for the Rx interrupt.

Add new page to the documentation listing existing LUFA powered projects, fix up some inaccuracies in the documentation.