Make notcurses_render() a static inline wrapper around
ncpile_render(). Remove the deprecated
notcurses_render_to_file() and ncpile_render_to_file().
ABI3 work #1777.

* [heuristics] GNU screen 4x never has rgb

* [BitmapSmoothMove] only WARN in test until sixel supports this #2258

* add minimal example for #2266

* contour: enable sextants

* interp PoC: clean up ncvisual #2266

* ncselector_options: constify string arguments

* Constify strings in selector/mselector_items

Use internal types to track items within the
selector/mselector widgets, rather than pressing the
user-provided item structs into double-duty. With this
change, we can constify the strings within those
user-provided items. Do so, also removing the internal-side
elements. Update documentation. Closes #2267.

* constify ncmenu_item/_section strings

* Use Windows pipes for input readiness notification (#2263)

* [windows] use CreatePipe for input #2244
* [input] read and write to Windows readiness handles #2244
* inputready_fd: not on windows, alas

* for now, if it's on windows, it's windows terminal #2248

* tabbed janitorial work

clean up memory leak of tab names
ignore NCTYPE_RELEASE in tabbed PoC
constify strings in nctabbed_options

* notcurses-demo FPS graph: back to straight seconds

* [info] expand some emoji into proper literals

* drop textplay PoC

* remove poc for issue #2266

* constify ncselector_item reference fix #2270

* [ncplayer] restore pause functionality with NCTYPE_RELEASE

* stop pushing termtype to interrogate_terminfo

* menu PoC: ignore NCTYPE_RELEASE

* properly name Windows Terminal

* [windows] HANDLE, not PHANDLE

* ncvisual_render -> ncvisual_blit (core/test) #1462

* ncvisual_render -> ncvisual_blit (docs)

* ncvisual_render -> ncvisual_blit (nctetris)

* [keller] fix up for ncvisual_blit() #1462

* stacking tests: ncvisual_render() -> ncvisual_blit() #1462

* all PoCs: ncvisual_render -> ncvisual_blit #1462

* restore ncvisual_inflate(), for now

* pixel PoC / ncneofetch -> ncvisual_blit() #1462

* notcurses-info: ncvisual_blit, inline all emoji #1462

* rotate PoCpp: ncvisual_blit() #1462

* xray/grid: ncvisual_blit() #1462

* remove last instances of ncvisual_render() #1462

* remove old-style notcurses_ rendering functions

Make notcurses_render() a static inline wrapper around
ncpile_render(). Remove the deprecated
notcurses_render_to_file() and ncpile_render_to_file().
ABI3 work #1777.

* ncstrwidth() becomes static inline wrapper #1777

* remove deprecated ncvisual_subtitle()

* kill ncvisual_inflate(), long deprecated #1777

* remove deprecated palette256 wrappers #1777

* kill ncplane_new() #1777

* remove deprecated renderfp field from notcurses_options #1777

* reorder ncstats fields to match documentation #1777

* kill deprecated style functions #1777

* ncplane_move{top, bottom} become static inline #1777

* fix up move_above()/move_below() #1777

* ncplane_pixelgeom -> ncplane_pixel_geom() #1777

* ncstyle functions ought return uint16_t #1777 #2200

* ncvisualplane_create: provide new pile functionality #1462

* introduce ncvisual_blit() #1462

* reduce ncvisual_render() to wrapper around ncvisual_blit() #1462

* convert most ncvisual_render()s to ncvisual_blit() #1642

Co-authored-by: joseLuís <joseluis@andamira.net>