BGE: Added getActionName() function to KX_GameObject()

It works similar to getActionFrame(), you have to give a layer or not (for layer 0) as the argument and it returns the name of the animation that the object is currently playing.

Example:

```
import bge
own = bge.logic.getCurrentController().owner
own.playAction("SomeAction",0,20)
print(own.getActionName())
```
>> SomeAction

Here is an example file, just open the blend file with the terminal opened
and press P, you can see how the current animation is being printed:
{F217484}

Reviewers: moguri, hg1, panzergame, campbellbarton

Reviewed By: panzergame

Subscribers: campbellbarton, hg1, #game_engine

Projects: #game_engine

Differential Revision: https://developer.blender.org/D1443

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

@@ -972,6 +972,16 @@ base class --- :class:`SCA_IObject`
       :return: The current frame of the action
       :rtype: float
 
+   .. method:: getActionName(layer=0)
+
+      Gets the name of the current action playing in the supplied layer.
+
+      :arg layer: The layer that you want to get the action name from.
+      :type layer: integer
+
+      :return: The name of the current action
+      :rtype: string
+
    .. method:: setActionFrame(frame, layer=0)
 
       Set the current frame of the action playing in the supplied layer.