SaveManager called from modules crash fix

[BenjaminAmos]

Description

This pull request fixes a crash caused by modules, directly or indirectly, calling SaveManager to save the game.

In the case of the warp crash, the StarPort class was attempting to save the game upon arrival when it triggered the crash.

Testing

• Clone the warp module with git clone https://github.com/DestinationSol/warp.git modules/warp.
• Start a new game with the Warp Endeavour ship
• Try using the ship's ability to tunnel to the nearest planet

Notes

• This is a sub-set of Expand API classes exposed to modules #648.
• This fixes Warp Endeavour ability causes game crash DestinationSol/warp#3.