BGE: New Mouse Actuator

Disclaimer: The author of this patch is Geoffrey Gollmer (gomer). I only updated the patch to the current git master status, reworked several parts to fit well with current coding style and applied several fixes.

This actuator allows users to show/hide the mouse cursor using logic bricks, as well as control object rotation with a mouse in the BGE.
The mouse rotation is flexible enough to allow any type of mouse look, as well as banking for flight controls.

{F94520}

{F91859}

Blend file for testing Mouse actuator (with default parameters and crosshair): {F94920}

Reviewers: moguri

Reviewed By: moguri

CC: gomer, lordodin

Differential Revision: https://developer.blender.org/D559

doc/python_api/rst/bge.logic.rst

@@ -72,6 +72,7 @@ See the actuator's reference for available methods
    * :class:`~bge.types.KX_CameraActuator`
    * :class:`~bge.types.KX_ConstraintActuator`
    * :class:`~bge.types.KX_GameActuator`
+   * :class:`~bge.types.KX_MouseActuator`
    * :class:`~bge.types.KX_NetworkMessageActuator`
    * :class:`~bge.types.KX_ObjectActuator`
    * :class:`~bge.types.KX_ParentActuator`
@@ -764,6 +765,16 @@ See :class:`bge.types.KX_GameActuator`
 .. data:: KX_GAME_SAVECFG
 .. data:: KX_GAME_LOADCFG
 
+.. _mouse-actuator:
+
+---------------
+Mouse Actuator
+---------------
+
+.. data:: KX_ACT_MOUSE_OBJECT_AXIS_X
+.. data:: KX_ACT_MOUSE_OBJECT_AXIS_Y
+.. data:: KX_ACT_MOUSE_OBJECT_AXIS_Z
+
 ---------------
 Parent Actuator
 ---------------