notify_on_stop now gives an error if it's
called while the stage is not moving.
This means you can safely issue the command and await a response.
If the stage is moving, it will block until
the stage stops. If it's not moving, it will return immediately.
- Added endstop and light_sensor module
- Improved configuration by splitting wiring configs to boards.h
- Added a unit test for argument parsing
- Fixed many smaller bugs