Add support for reliability mods

[digiefel]

Add an interface that can be hooked into by reliability mods and lets them check when the engine is running, and eventually break the engine.

[sswelm]

I guess a simple boolean in the VesselData might be used to indicate if an engine is broken or not. we could add a basic static method that would allow you to change it state. The Method would only need 2 variable, vesselid (guid) and broken state (boolean)

[digiefel]

We need one broken state per engine, one per craft isn't going to be enough