Moving to Python to make Windows build scripts more maintainable.
It's intended to be a drop-in replacement, so it should be possible to just switch `.\build-deps.cmd` to `python build-deps.py`, keeping exactly the same arguments and behaviour will be the same.
`build-deps.cmd` is deprecated, but not yet removed, but will be shortly after more testing.
Other batch files will be migrated to Python shortly after too.
Andrej730