Add AVRStudio 4 project files to the ClassDriver Host mode demos.

...sDriver/JoystickHostWithParser/JoystickHostWithParser.aps

Demos/Host/ClassDriver/KeyboardHost/KeyboardHost.aps

...sDriver/KeyboardHostWithParser/KeyboardHostWithParser.aps

Demos/Host/ClassDriver/MIDIHost/MIDIHost.aps

Demos/Host/ClassDriver/MassStorageHost/MassStorageHost.aps

Demos/Host/ClassDriver/MouseHost/MouseHost.aps

...t/ClassDriver/MouseHostWithParser/MouseHostWithParser.aps

Demos/Host/ClassDriver/PrinterHost/PrinterHost.aps

.../Host/ClassDriver/RNDISEthernetHost/RNDISEthernetHost.aps

Demos/Host/ClassDriver/StillImageHost/StillImageHost.aps

.../Host/ClassDriver/VirtualSerialHost/VirtualSerialHost.aps

LUFA.pnproj