gallery updates:
- subnet with "extract contents" button for VOP networks
- Make Instance Transforms (instancing attribs->matrices) subnets (AttribVOP, VOP subnet)
- other gallery item c.c.-s
Fluid Source qL SOP: some UI cosmetics
(wip) Construction Guide qL OBJ
Merged work:
- gallery updates (mostly 'extract instance xform')
- Fluid Source qL SOP, UI cosmetics
- wip: Construction Guide qL OBJ (cplane, views, obj vis., etc)