Added current firmware and matching drivers for windows.

Current state:
 - working USB-Composite Device with the following functions:
   - 3 CDC-devices for SPI/USART/TWI-gateways (interfaces 0-5) -> gateways not yet implemented
   - USB-HID keyboard (interface 6) as actual inputdevice
   - Vendor-Class USB device for configuration and firmware updates (interface 7; alternate interface 1) -> currently working on
 - Vendor-Class USB communication is working and a simple protocol is implemented, working on a Windows-Tool (ndkConfigurator) to talk to the device.
 - a trimmed-down version of the firmware with only the Vendor-Class interface has to be made for the bootloader.