DUETi - Installer for DUET UEFI on BIOS Bootloader

[SugoiDogo]

Finally figured out all the details for getting exfat bootloader installed. Turns out exfat has a checksum component to its filesystem header, for which microsoft provides only C example code to calculate that I don't understand. Thankfully found an exfat implementation on pypi that was GPL licensed, allowing me to copy their function. With that done, I'm now starting work on the GUI to provide easy device and bootloader selection. I'm also setting up the nuitka build system to release native executables for mac, windows, and linux, to further reduce edge cases like python interpreter incompatibility or having to use the tool in a rescue environment without python available.