Add Cairo syntax highlighting #347
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This PR adds a really hacky and probably mostly wrong grammar file for Cairo to fix syntax highlighting issues with single-quoted strings.
I created this grammar file by cloning the Rust grammar from https://github.com/shikijs/textmate-grammars-themes/blob/main/packages/tm-grammars/grammars/rust.json. I then updated all references to
rustin the various identifiers tocairoinstead, and then I removed any references to lifetimes (which is required to ensure the lifetime regex doesn't match before the single-quoted string regex matches) and added a block for handling single-quoted strings (basically just cloning the double-quoted string block and changing the begin and end regex).I'm not remotely familiar with the textmate grammar syntax so this is almost certainly buggy and incorrect in some ways but it seems to work fine for the code block we have. We'll just have to test it with any new code blocks and fix as needed.