PENDING changes

## from changes-20210321-20210406.txt
- all tabbed & tab widget functions

## from changes-20210406-20210410.txt
bindgen add:
- [ ] ncdirect_stream
- [x] ncplane_as_rgba
- [x] ncplane_pixelgeom
- [x] ncvisual_blitter_geom
bindgen del
- [x] ncplane_rgba

## ...