BGE: TrackTo actuator: increasing up & track axis options

This is related to Task T34861 to increase up & track axis options for TrackTo actuator. I've just added it to differential to facilitate an easier review.

With the patch applied you can select X, Y and Z axis for the Up axis, and X, Y, Z, -X, -Y and -Z for the track axis.

Related to the implementation I have used the algorithm from Trackto constrain placed in constrain.c but adapted to be used with MOTO library.

The wiki docs are here (http://wiki.blender.org/index.php/User:Lordloki/Doc:2.6/Manual/Game_Engine/Logic/Actuators/Edit_Object#Trackto_Actuator).

Test file is here: {F97623}

I have also uploaded 2 screenshots showing the UI modifications to the TrackTo actuator:

{F91992} {F91990}

Reviewers: moguri, dfelinto

Reviewed By: moguri

CC: Genome36

Differential Revision: https://developer.blender.org/D565

release/scripts/startup/bl_ui/properties_object.py

@@ -301,10 +301,11 @@ class OBJECT_PT_relations_extras(ObjectButtonsPanel, Panel):
 
         split = layout.split()
 
-        col = split.column()
-        col.label(text="Tracking Axes:")
-        col.prop(ob, "track_axis", text="Axis")
-        col.prop(ob, "up_axis", text="Up Axis")
+        if context.scene.render.engine != 'BLENDER_GAME':
+            col = split.column()
+            col.label(text="Tracking Axes:")
+            col.prop(ob, "track_axis", text="Axis")
+            col.prop(ob, "up_axis", text="Up Axis")
 
         col = split.column()
         col.prop(ob, "use_slow_parent")