- add mutex around mutex send instruction
- add minimum delay between sent messages
- detect situation where both motors are off and send special both motor
stop command. This might fix issue "right motor stay always on"
- make motorctl compatible with different drivers
- pass set function instead of specific motor object
- add lambda function in config.cpp
- update config to use one new sabertooth driver instead of two single100a
- main test controlled motor
since board_single uses mostly the same code as board_control and
board_motorctl several files are outsorced to common folder to prevent
dupliate code and different versions
