Add and update more Atmel Studio project description XML files.

Demos/Device/ClassDriver/MassStorage/asf.xml

Demos/Device/ClassDriver/MassStorageKeyboard/asf.xml

Demos/Device/ClassDriver/VirtualSerialMassStorage/asf.xml

LUFA/StudioIntegration/VSIX/asf-manifest.xml

LUFA/StudioIntegration/generate_caches.py

LUFA/StudioIntegration/makefile

Projects/AVRISP-MKII/asf.xml

Projects/Benito/asf.xml

Projects/HIDReportViewer/asf.xml

Projects/LEDNotifier/asf.xml

Projects/MIDIToneGenerator/MIDIToneGenerator.h

Projects/MIDIToneGenerator/asf.xml

Projects/Magstripe/asf.xml

Projects/MediaController/asf.xml

Projects/MissileLauncher/asf.xml

Projects/RelayBoard/asf.xml

Projects/SerialToLCD/asf.xml

Projects/TempDataLogger/asf.xml

Projects/USBtoSerial/asf.xml

Projects/Webserver/asf.xml