Add the STM32G0 to the CMake setup. This CMake is specific to the STM32G0B1xK device. Also included the linker file that is required for the make.
Currently G0 targets are disabled by default to keep project buildable
as-is.
Some files have Windows line endings which is annoying, since pathes
won't apply, diffs looks ugly etc. So do convert the few files which
have Windows line endings to use Unix line endings as well.