Improve optimal-quantifier-concatenation

[RunDevelopment]

There is a whole class of fixable problems optimal-quantifier-concatenation (OQC) can't detect yet. Right now, OQC can only detect (and fix) the concatenation of single-character quantifier (e.g. \d*\w*). It's can't detect anything else.

OQC should also be able to detect (and fix) (?:foo)?\w+ == \w+.

More generally, if we have a single-character quantifier A{n,∞} and a quantifier B{p,q}, we will be able to simplify B{p,q} to B{p} if all possible consumed characters of B are a subset of A (getConsumedCharacters(B) ⊆ getConsumedCharacters(A)).