Graceful crew/engine errors

[KemGus]

Keeps illegal crew linked instead of dropping them, and surfaces crew/fuel legality issues on the overlay instead of spamming chat.

Does followign checkmarks from the dev board:

• Engines no longer throw an error in chat when fuel is connected in the wrong order, they just display the situation if you look at the engine and don't activate.
• Crew no longer throw an error in chat when crew aren't connected, the weapons just display the error and don't activate.

example 1

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example 2

Known issue (if it is):

1. if warning exists, it doesn't reupdate unless "Active" state changes. Probably is good for optimization
2. Doesn't show warnings after spawn, unless there is a problem with either component.

[KemGus]

oops, found an issue here, reverting back to draft.