Hue grammars online editor/tester

[mingodad]

I've just added hue-sql-generic grammar to https://mingodad.github.io/parsertl-playground/playground/ an Yacc/Lex compatible online editor/tester (select Hue SQL generic parser from Examples then click Parse to see a parser tree for the content in Input source editor).

I hope that it can help debug/develop/document/test this project grammars !

Any feedback is welcome !

[bjornalm]

FYI @JohanAhlen