make "GetCurrentControlPoint" in SplineController more accessable

[VampirasuGameStudio]

Hi folks,

first of all i wanna say that your asset is quiet nice!
At the moment i am working on a system where objects should follow a list of splines and should have some
breaks at specific positions (ControlPoints/SegmentPoints). Also they should lower there speed on approaching.
To archive this i implemented a new Controller derieved from SplineController. The problem is to get the current
and the next Controlpoint because the method "GetCurrentControlPoint" is set to private. I think it make sense to
put it at least on protected.

greetings,
Sebastian.