Spawnpoint and respawn stuff

New LurchRespawn component holds respawn points and checks for level bounds as well as fall distance.
The closest respawn point will be selected, all previous respawn points will be marked invalid (no longer available).

Assets/Script/LurchMovement.cs

@@ -118,7 +118,7 @@ public class LurchMovement : MonoBehaviour {
         }
     }
 
-    bool LurchOnGround()
+    public bool LurchOnGround()
     {
         RaycastHit hit;
         if (Physics.Raycast(theLurch.position, Vector3.down, out hit, 0.4f))