Small Patch - 2 crash bugs - 01/14/2024

Fixed 2 crash bugs and some stability improvements.

Crash bug that happened when a transport ship docked in ship mode, then undocked. If the transport ship had fleet ships, the fleet ships would be re-created causing the crash.

Crash bug that happened on using an active upgrade, then entering the overworld mode. Active upgrade code not properly cleaned up on exiting ship mode.