FXLoad 2.0

Initial release of FXLoad from Mbed CE.

Includes:

• New CMake-based build system
• MS Visual Studio compiler support
• Windows installer
• Github Actions CI jobs
• Rewritten, more robust CLI using the CLI11 library
• Improved error messages (esp. for failing to open USB devices)
• Improved device selection menu
• Bugfix: RAM size now correctly detected for FX2LP