Fix: iren is the the right interactor where to set picker
Fix: use a dynamic point picker / area picker switch

Revert back the default picker to a point picker.
When in select mode the point picker is replaced with an area picker.
Point picking events modified accordingly.
added /bigobj compile option to fix build problems with MSVC

to fix "error C1128: number of sections exceeded object file format
limit: compile with /bigobj "