Add new MIDIHost LowLevel demo application.

Make unfinished device mode applications use the VID/PID reserved for LUFA development devices.

Demos/Host/LowLevel/MIDIHost/MIDIHost.txt

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+/** \file
+ *
+ *  This file contains special DoxyGen information for the generation of the main page and other special
+ *  documentation pages. It is not a project source file.
+ */
+ 
+/** \mainpage MIDI Host Demo
+ *
+ *  \section SSec_Compat Demo Compatibility:
+ *
+ *  The following table indicates what microcontrollers are compatible with this demo.
+ *
+ *  - AT90USB1287
+ *  - AT90USB647
+ *
+ *  \section SSec_Info USB Information:
+ *
+ *  The following table gives a rundown of the USB utilization of this demo.
+ *
+ *  <table>
+ *   <tr>
+ *    <td><b>USB Mode:</b></td>
+ *    <td>Host</td>
+ *   </tr>
+ *   <tr>
+ *    <td><b>USB Class:</b></td>
+ *    <td>Audio Class Device</td>
+ *   </tr>
+ *   <tr> 
+ *    <td><b>USB Subclass:</b></td>
+ *    <td>MIDI Subclass</td>
+ *   </tr>
+ *   <tr>
+ *    <td><b>Relevant Standards:</b></td>
+ *    <td>USBIF USB MIDI Audio Class Standard</td>
+ *   </tr>
+ *   <tr>
+ *    <td><b>Usable Speeds:</b></td>
+ *    <td>Full Speed Mode</td>
+ *   </tr>
+ *  </table>
+ *
+ *  \section SSec_Description Project Description: 
+ *
+ *  MIDI host demonstration application. This demo will enumerate an attached USB-MIDI device, and print incomming MIDI note
+ *  on and off messages on any channel to the serial port. Pressing the board joystick will send note on and off messages to
+ *  the attached MIDI device, with the board HWB controlling the note channel.
+ *
+ *  \section SSec_Options Project Options
+ *
+ *  The following defines can be found in this demo, which can control the demo behaviour when defined, or changed in value.
+ *
+ *  <table>
+ *   <tr>
+ *    <td>
+ *     None
+ *    </td>
+ *   </tr>
+ *  </table>
+ */