Add support for two different 24-bit colour methods.
1) XTerm using semicolons. CSI 38/48 ; 2 ; 0 ; R ; G ; B m 2) PabloDraw/TundraDraw. CSI 0/1 ; R ; G ; B m These use a temporary internal palette of 15840 entries to ensure what's on the screen is correct. Scrollback data may be incorrect however.
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