Port python imports to the new machinekit-hal cmake structure and add mksocfpga compatibility

[the-snowwhite]

The new cmake build system in machinekit-hal changed a lot of python import references, breaking the python based scripts.
This made getting hal_ros_control to run on mksocfpga boards a bit of a task.
So far I have managed to get the hal_rrbot_control hal_rrbot_simulation.launch up and running on the:
Armhf based DE10-Nano and the arm64 based Kria KV/KR-260.
without glitches in Ubuntu 20.04 Focal ros Noetic.
A PR will follow shortly.

[the-snowwhite]

Added PR for foxy branch #20

[the-snowwhite]

@kylc @vatanaksoytezer
Is this repository still alive ?