Added support STM32CubeMX v4.20.0

[datashit]

Using file .cproject.
Added auto find file system. (Support source, include and startup) .
Added auto symbol definitions.

[eugene-babichenko]

Hi,

I, probably, won't merge this directly, because I'm in progress with the completely new code, but you provided me with the good idea of using .cproject file, so you'll be mentioned.
Anyways, thank you!

[eugene-babichenko]

After reviewing your code and it's results I have a thing to mention: your code produces CMakeLists.txt with hardcoded lists of files. It doesn't make any use of GLOB_RECURSE. I will fix that and integrate the code in my working branch. Also, I'd like to recommend you using logging library.