Updated refa + fixed 2 cases of exponential backtracking

[RunDevelopment]

I worked on refa over the last couple of days and added 2 major improvements:

1. The parser will now resolve certain backreferences. E.g. /("|')(?:(?!\1)[^\\\r\n]|\\.)*\1/ will be parsed as /"(?:(?!")[^\\\r\n]|\\.)*"|'(?:(?!')[^\\\r\n]|\\.)*'/.
2. Assertions can be applied to the pattern. E.g. /"(?:(?!")[^\\\r\n]|\\.)*"/ -> /"(?:[^"\\\r\n]|\\.)*"/.

These two additions enable our current exponential backtracking test to analyze a few more regexes. And guess what, it found new cases of exponential backtracking. The AsciiDoc ones are true positives and have been fixed. The Perl one is a false positive but I "fixed" it anyway.

[github-actions]

JS File Size Changes (gzipped)

A total of 2 files have changed, with a combined diff of +1 B (+0.0%).

file	master	pull	size diff	% diff
components/prism-asciidoc.min.js	1.62 KB	1.62 KB	-2 B	-0.1%
components/prism-perl.min.js	999 B	1 KB	+3 B	+0.3%

Generated by 🚫 dangerJS against 97e27e5

[RunDevelopment]

I'll merge this now cause it's kinda important.

[RunDevelopment]

Should there still be anything that requires changes, please comment on this PR (or the merge commit) and I'll make the requested changes in a separate PR.