Revision 0.9.7

[sinclairzx81]

This PR adds an additional Until combinator (UntilNonEmpty) which fails if the parser matches on a zero length string (indicating the sentinel was the next character). This is used to mirror (one or more) semantics, where the original Until combinator handled (zero or more).

This combinator is envisioned for use in recursive matching scenarios to mitigate stack overflow for non-consuming matches. It's noted that in the Until case, stack overflow was difficult to avoid when matches would succeed for zero captures (meaning the cursor never advances). This combinator aims to enable an alternative parsing strategy where parsing can terminate for zero length, with subsequent Const used to explicitly consume the sentinel.