PENDING changes

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

## from changes-20210406-20210410.txt
bindgen add:
- [ ] ncdirect_stream

## from changes-20120518-20210603.txt …

- ncdirect_styles
- ncdirect_supported_styles

- ncplane_erase_region
- ncplane_align

- ncvisual_default_blitter
- ncvisualplane_create

- nccell_width

- ncpalette_get_rgb8
- ncpalette_set_rgb8

- notcurses_cursor_yx

- ncinput_nomod_p