[Core] Get rid of bounding radius in GetNearPoint[2D] and ObjectPosSelector [c2066]

This changes how ObjectPosSelector is used.
It changes the way how the functions Object::GetNearPoint and Object::GetNearPoint2d behave.

So you need to check all places where these functions are used if they are still used correctly.

Especially check your scripts!

Signed-off-by: Daniel S. Reichenbach <daniel@kogitoapp.com>