More Bug Fixes

-=-=-=-=-=-=-

-Fixed a few bugs in Mixer, now playback of chiptunes works great :)
-Changed how visibility AABB generation from skeletons work, it's fully automatic and real-time now, generated from current skeleton pose for the frame.
-Fixed camera in 3D kinematic character demo.

3d/kinematic_char/follow_camera.gd

@@ -45,13 +45,13 @@ func _fixed_process(dt):
 	var col = ds.intersect_ray(target,target,collision_exception)
 	var col_right = ds.intersect_ray(target,target+Matrix3(up,deg2rad(-autoturn_ray_aperture)).xform(delta),collision_exception)
 	
-	if (col!=null):
+	if (!col.empty()):
 		#if main ray was occluded, get camera closer, this is the worst case scenario
 		delta = col.position - target	
-	elif (col_left!=null and col_right==null):
+	elif (!col_left.empty() and col_right.empty()):
 		#if only left ray is occluded, turn the camera around to the right
 		delta = Matrix3(up,deg2rad(-dt*autoturn_speed)).xform(delta)
-	elif (col_left==null and col_right!=null):
+	elif (col_left.empty() and !col_right.empty()):
 		#if only right ray is occluded, turn the camera around to the left
 		delta = Matrix3(up,deg2rad(dt*autoturn_speed)).xform(delta)
 	else: