Move vars/functions out of clojure.core.typed, callable from CLJS impl
Move set! implementation into check.set-bang
Update CLJS to 0.0-2227
Update piggieback to 0.1.3
Use check-set! in CLJS impl
Move let/loop checking into own files
WIP CTYP-145: now producing a zero-dependency "rt" artifact from core.typed that
contains only annotation machinery, suitable for use in libraries