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

doc/python_api/rst/bge.logic.rst

@@ -868,6 +868,23 @@ See :class:`bge.types.KX_SteeringActuator.behavior`
 
    :value: 3
 
+.. _logic-trackto-actuator:
+
+-----------------
+TrackTo Actuator
+-----------------
+
+See :class:`bge.types.KX_TrackToActuator`
+
+.. data:: KX_TRACK_UPAXIS_POS_X
+.. data:: KX_TRACK_UPAXIS_POS_Y
+.. data:: KX_TRACK_UPAXIS_POS_Z
+.. data:: KX_TRACK_TRAXIS_POS_X
+.. data:: KX_TRACK_TRAXIS_POS_Y
+.. data:: KX_TRACK_TRAXIS_POS_Z
+.. data:: KX_TRACK_TRAXIS_NEG_X
+.. data:: KX_TRACK_TRAXIS_NEG_Y
+.. data:: KX_TRACK_TRAXIS_NEG_Z
 
 =======
 Various

doc/python_api/rst/bge_types/bge.types.KX_TrackToActuator.rst

@@ -37,3 +37,25 @@ base class --- :class:`SCA_IActuator`
 
       :type: boolean
 
+   .. attribute:: upAxis
+
+      The axis that points upward.
+
+      :type: integer from 0 to 2
+
+      * KX_TRACK_UPAXIS_POS_X
+      * KX_TRACK_UPAXIS_POS_Y
+      * KX_TRACK_UPAXIS_POS_Z
+
+   .. attribute:: trackAxis
+
+      The axis that points to the target object.
+
+      :type: integer from 0 to 5
+
+      * KX_TRACK_TRAXIS_POS_X
+      * KX_TRACK_TRAXIS_POS_Y
+      * KX_TRACK_TRAXIS_POS_Z
+      * KX_TRACK_TRAXIS_NEG_X
+      * KX_TRACK_TRAXIS_NEG_Y
+      * KX_TRACK_TRAXIS_NEG_Z