spring is here

what's in it:
- Bounds qL SOP (new)
- Xform-to-BBox qL SOP: various bug fixes
- Vector qL SOP: minor enhancements
- Space Partition qL SOP: major speed improvement
- Point Topology qL SOP: minor changes
- Environment qL OBJ: minor code fixes (the "previously agreed" fix :D)
- Attrib Ramp qL SOP: fixed H12.5-related crash (important!)
- Null qL OBJ: minor enhancements
- Peak qL SOP: minor fix
- new: qLib toolbar (work in progress)
- NEW: Attrib Builder qL SOP (experimental, name might change; PointAttr qL SOP replacement)