Numerous improvments to the engine & physics system (thrust arrown, freezing, gimbal, etc...)

Assets/Scripts/MainEngine.cs

@@ -20,7 +20,7 @@ public class MainEngine : MonoBehaviour
     public bool engineOnline = false;      // true if engine is running
     public bool engineIgnited = false;     // true if ignition completed
     public bool restartable = true;        // if false, engine cannot restart once shut down
-    public float throttleInput = 0f;       // 0-1 input from pilot
+    [Range(0f, 1f)]public float throttleInput = 0f;       // 0-1 input from pilot
     public float thrust = 0f;              // kN
     public float fuelFlowRate = 0f;        // kg/s