[12563] Get rid of bounding radius in GetNearPoint[2D] and ObjectPosSelector

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!
[12564] Improve ObjectPosSelector

Now a spot already occupied by the searcher will be prefered