fix: loading csharp, markdown-math, and search-result syntax failed #680
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This PR fixes parsing of some TextMate syntax files that use negative variable lookbehinds which is not supported by the joni regex library. See #677
Currently this is done in a rather naive but performant way by rewriting specific incompatible regex patterns to forms parseable by joni.
E.g. patterns starting with
(?<!\.\s*)are rewritten to(?<!\.)\s*and patterns starting with(?<=^\s*)are rewritten to(?<=^)\s*