ClojureScript support

[ikitommi]

What an brilliant library! Would like to use this to add support for sequential schemas in malli, but it should support ClojureScript.

[cgrand]

I'm not happy with the complexity I added to the original design to support lookaheads.

Clojurescript support shouldn't be too hard.

[ikitommi]

Malli has now it's own regex-engine, far less elegant, but does what is needed.