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fixes #34, fixes hackerb9/lsix#56
the "4" signals (depending on the first number) that this terminal is capable of displaying sixel graphics.
"6" or now "63" tells what kind of terminal it is.
https://www.xfree86.org/current/ctlseqs.html
https://terminalguide.namepad.de/seq/csi_sc/
https://vt100.net/docs/vt510-rm/DA1.html
for comparison:
mlterm replies with: "\033[?63;1;2;3;4;6;7;15;18;22;29c"
xterm (with sixel support enabled): "\033[?63;1;2;4;6;9;15;16;22;28c"