• fixes up build and unit test problems when using DFSG_BUILD.
• add NCPLANE_OPTION_VSCROLL to enable scrolling on a plane from the beginning.
• add NCPLANE_OPTION_AUTOGROW to support autogrowth of planes
  • if scrolling is enabled, autogrowth happens down
  • otherwise, it happens right
• nctrees are now dynamic. add nctree_del() and nctree_add(). you can now create an empty nctree. #2458
• query palette from terminals supporting this functionality #2442
• restore original palette on terminals lacking XTPUSHCOLORS/XTPOPCOLORS #2435
• stop issuing oc on startup and shutdown, preserving custom palettes #2450
• fix static linking #2454
• add some Kitty keyboard protocol elements we were missing #2439, #2452
• properly handle control sequences split across multiple reads #2448
• properly handle newlines in ncplane_puttext() #2446
• don't allow ncchannels_reverse() to enter illegal states #2421
• copy EGCs when calling ncplane_putc(), as they could be invalidated within (fixes OfflineEGCs unit test) #2420
• fix for Linuxbrew build #2428
• install alternate signal stack handler via sigaltstack() on UNIX #2424
• faster ncplane_resize() when only the y dimension is changing #2425