Remove Python dependency to Build/Flash the Firmware

[bvernoux]

Remove the usage of Python to build the version (from GitHub Tag) and build DFU for STM32F405
=> https://github.com/hydrabus/hydrafw/tree/master/src/build-scripts

1. Remove hydrafw-revision.py / hydrafw-version.py

   • To be done with GitHub Actions after each Commit ...
     • To check integration of https://github.com/marketplace/actions/gittools
   • Other idea ?

2. Remove dfu-convert.py

   • Replace it with a native C code (multi-platform) to be built with GCC/MinGW2 ...
     • To check integration of https://github.com/encedo/hex2dfu
   • Other idea ?

3. Remove Windows Executable

   • https://github.com/hydrabus/hydrafw/tree/master/utils/windows_dfu_util
   • To rebuild them with open source code with workflow/artifact ?

4. Modification of Makefile (to remove anything related to Python script)

   • https://github.com/hydrabus/hydrafw_hydranfc_shield_v2/blob/master/src/Makefile

[bvernoux]

Fixed with #173