Update erltrek.hrl

* Change #enterprise_status.moving to #enterprise_status.impulse_move
* Add #enterprise_status.impulse_course
Update erltrek_setup.erl

* setup_state/0:
  * Change #enterprise_status.moving to #enterprise_status.impulse_move
  * Add #enterprise_status.impulse_course
Update erltrek_event.erl

Add impulse engine commands to enterprise_command/2
Update erltrek_move.erl

* Add impulse engine functions, more work needed, WIP
Update erltrek.hrl

* Fix typo on #enterprise_status.impulse_course