BGE: Remove KX_IPOActuator.

KX_IPOActuator is not used since 2.4.

This patch removes:
	- KX_IPOActuator.h/cpp;
	- Python doc;
	- Write of IPO actuator in write.c;
	- Allocation of IPOactuator in sca.c;
	- Conversion in KX_ConvertActuators.cpp;
	- Initialization of the python proxy in KX_PythonInitTypes.cpp;
	- Other minor remove in logic_windows.c and in KX_PythonInit.cpp.

Reviewers: sybren, campbellbarton

Reviewed By: campbellbarton

Subscribers: moguri

Differential Revision: https://developer.blender.org/D1603

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

@@ -1,65 +0,0 @@
-KX_IpoActuator(SCA_IActuator)
-=============================
-
-.. module:: bge.types
-
-base class --- :class:`SCA_IActuator`
-
-.. class:: KX_IpoActuator(SCA_IActuator)
-
-   IPO actuator activates an animation.
-
-   .. attribute:: frameStart
-
-      Start frame.
-
-      :type: float
-
-   .. attribute:: frameEnd
-
-      End frame.
-
-      :type: float
-
-   .. attribute:: propName
-
-      Use this property to define the Ipo position.
-
-      :type: string
-
-   .. attribute:: framePropName
-
-      Assign this property this action current frame number.
-
-      :type: string
-
-   .. attribute:: mode
-
-      Play mode for the ipo. Can be on of :ref:`these constants <ipo-actuator>`
-
-      :type: integer
-
-   .. attribute:: useIpoAsForce
-
-      Apply Ipo as a global or local force depending on the local option (dynamic objects only).
-
-      :type: boolean
-
-   .. attribute:: useIpoAdd
-
-      Ipo is added to the current loc/rot/scale in global or local coordinate according to Local flag.
-
-      :type: boolean
-
-   .. attribute:: useIpoLocal
-
-      Let the ipo acts in local coordinates, used in Force and Add mode.
-
-      :type: boolean
-
-   .. attribute:: useChildren
-
-      Update IPO on all children Objects as well.
-
-      :type: boolean
-