• Addition of ncvisual_from_rgba(), ncvisual_from_bgra(), and ncvisual_from_plane() to create ncvisuals from buffers in memory or ncplanes. ncvisual_open_plane() was renamed to ncvisual_from_file(). The former has been retained as a (deprecated) alias.
• ncvisual_rotate() has been added, accepting an arbitrary number of radians to rotate.
• ncplane_at_yx()'s first argument is now const, as it always ought have been.
• notcurses-view supports -k to inhibit the alternate screen, and ensures valid arguments to -s
• Drop -fkeep-inline-functions so we cease exporting a bunch of C++ stdlib symbols
• Many fixes to ncsubproc and ncfdplane