- Add support for 2;r;g;b color codes (much easier to deal with
than 5;x256 style codes)
- Fix 40-47 (standard background colors) so that they work
- Add support for italic
- Add support for empty arguments interpreted as 0
(0 is still not supported for "reset style", since it's not needed
with our non-standard usage of resetting styles on every escape
sequence, and it might cause compat issues)
- Fix ordering of 0-15 in the x256 colors to match the standard. The
"main" colors (selected via 30-37 for FG and 40-47 for BG) are still
artificially bright for FG, kept for compatibility, but there's no
reason to screw up the x256 colors. (Hopefully usage of that section
should be small anyway.)
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