Refactor - split up functions into files

[LoLei]

For now this adds directories and files which have code split up and grouped together according to functionality.

In a future refactoring step, classes could be used as well, to avoid passing around arguments that much.
Also, more type hints should be used, although I'm hesitant to go too fancy with that, as older Python versions might not support the newer type hint features. There is no minimum Python version requirement at the moment, although one could theoretically be set.

[GM-Script-Writer-62850]

on the note of python version lets include that in --version output

print("Python:", '.'.join([str(sys.version_info.major), str(sys.version_info.minor), str(sys.version_info.micro)]))

just add at the end of the if args.version: block in razer_cli.py

note that this pull request drops import sys from the razer_cli.py file which is needed for that

[GM-Script-Writer-62850]

i do not see anything broken with a quick test; python 3.8