Feature: Move head to mouse position.

See #176.
TODO:
- [x] write a draft code
- [ ] Get my pull-request into the LAOS firmware (https://github.com/LaosLaser/Firmware/pull/10)
- [ ] Find a reasonable resolution (https://github.com/t-oster/VisiCut/compare/develop...feature-move-head-position#diff-b6d5e8fe99310ccee2b942a4afd8b615R775)
- [ ] Internationalization (https://github.com/t-oster/VisiCut/compare/develop...feature-move-head-position#diff-dd385dda36b213a0d089058e49e332cbR115)
- [ ] Improve the UI