Added missing header to python bindings. The functional.h header is needed to be able to pass a lambda from python into renderer.setValueFunction.
Added missing header to python bindings.
The functional.h header is needed to be able to pass a lambda from python into renderer.setValueFunction.

FlorianRhiem/VFRendering,FlorianRhiem/VFRendering,FlorianRhiem/VFRendering,FlorianRhiem/VFRendering