Adding change renderer action. This action changes the renderer of the scene element it is attached to.
It can make the scene element go back to the original renderer... although I have no means to try it out right now.
I've also updated the tech demo with this action.
Ammending previous commit regarding #pr49. All comments but one integrated.
Ammending previous commit regarding #pr49.
Merge pull request #49 from jtorrente/change-appearance-effect

Adding change renderer action. This action changes the renderer of the s...