#1247 Add ability for Spheroid DSs to "Fly Off"

[scjazz]

Right now a Spheroid DS or small craft entering a ground map is stuck. It can never leave which can become problematic if there are enemy ASFs present.

Please consider adding a "Fly Off" and return feature.

Once the DS is at altitude 10 allow it to fly off and return. The return should be equivalent to a deploy "Any". The delay for the return should be similar to an Aerodyne.

tyvm for your consideration