Shuttle fixes

* Fixes the shuttle announcing that it will arrive in 7 minutes instead of 10.
* Adds the ability to force launch escape pods, so that they can be launched if a power outage or other damage prevents proper undocking
* Fixes a regression that caused ferry shuttles to become stuck if a launch was cancelled.

Note to downstream: This will require mapping changes, as escape pods use their own special docking controller type now, and not just simple_docking_controller