Prepare for multi-platform support
Add driver for LUFA DFU Bootloader
Rename hex to firmware
Rename reflash.bat to reflash-dfu.bat
Improve features of reflash-dfu
- Print usage
- Reflash hex when call with only one argument
- Reflash hex and eep when call with one hex and one eep arguments
- Reflash hex and replace existing hex when call with two hex arguments