- This moves ParserContext closer to operating on a RazorSourceDocument and exposes it at the parsing layer.
- Was not able to replace the `ITextDocument` property on `ParserContext` due to its current wiring. Our tokenizers rely on a single reader that iterates over the document and take turns tokenizing characters from that reader. The reader that the tokenizers pull from is also highly coupled with the parsers implementations; they end up moving the readers pointer frequently.