fix(python): properly highlight docstrings, f-strings, and escapes

[egelja]

This fixes python highlighting for docstrings, f-strings, and escape sequences.

Before

After

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Closes #169

[jcs090218]

I'm a bit confused here. How does switching the LOC solve the issue? 🤔

[egelja]

I figured this out by trial and error, so I can't give you a definitive answer, but my guess is that rules earlier in the file are matched before rules later in the file, and the first rule that matches "wins". So by switching the lines, we're switching the order that rules are matched in.

I think the main issue was that the (string) @string rule was grabbing all strings, and so the specific docstring and f-string rules were never being matched. By moving that rule down, it first tries to match the docstring and f-string rules before falling back to generic (string) @string.

[jcs090218]

Thank you for your explanation! That makes sense! :)