shnewto / bnf / 12615083518

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added Format trait to support different BNF syntaxes, and a basic implementation of ABNF  to demonstrate (#154)

* added support for some ABNF features, with a good bit of code duplication

* refactored formats into traits that are passed around via type parameters ala parse_from::<ABNF>(input)

* added support for comments yay

* added autodetecion of format in Grammar::FromStr(), tested slightly in tests/grammar.rs

* added adefault feature flag for ABNF since the monomorphization could increase compiletimes more than you'd expect(maybe?)

* fixed a bug where comments at the start of a grammar would confuse the auto-detector

* made ABNF nonterminals less... all-consuming

171 of 177 new or added lines in 6 files covered. (96.61%)

2150 of 2188 relevant lines covered (98.26%)

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