AI helpers

Here's an update from Al Geri-G:

This update is similar to that of LS09. It ensures that the assistant keeps the direction even if you interrupt the helper mode. Just move on without interruption, the helper-mode back to the approximate position and activate the helper.

Please note the following:
Press "9; hold long: Course will be deleted
Press "9; pressed briefly hold: the course is reversed should be used if in the other direction.