no pneumatic relay sound on brake acting speed change, enabled playback of multiple bookend sounds, extra pantograph control for ai during longer stops, shadow angle calculation tweak, moon appearance tweak, minor bug fixes

moon.h

@@ -16,8 +16,6 @@ public:
     void init();
     void update();
 	void render();
-    // returns location of the sun in the 3d scene
-    glm::vec3 getPosition() { return m_position; }
 	// returns vector pointing at the sun
 	glm::vec3 getDirection();
 	// returns current elevation above horizon