Enhance parser to understand more than just CSI sequences #65
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Currently PrintableRuneWidth() only looks out for CSI sequences in the ANSI standard. This PR adds support for common ST-terminated (ST = STRING TERMINATOR | "ESC " or "\a") sequences. Examples are OSC-sequences used by the sixel,iTerm2, DomTerm graphics format, APC-sequences (used for kitty graphics). This code is taken from my termimg library and modified slightly.
Fixes #64