Adds kitty.c/kitty.h implementing the kitty graphics protocol behind
KITTY_GRAPHICS_PATCH, enabled in patches.h.
Supports transmission (direct, file, temp file, POSIX shared memory),
the RGB/RGBA/PNG formats with a self-contained PNG decoder, zlib
compression, chunked transfers, placements with source rects, scaling,
cell offsets, z-index ordering with alpha blending via XRender,
relative and Unicode-placeholder virtual placements, the full set of
delete selectors, queries, image numbers and animation (frame
transfer, composition and playback).
