Split the build

[quoll]

An Asami deployment is currently built on an uberjar of everything. This is fine for Clojure, but in Clojurescript this includes all of asami.durable, and ClojureScript is much more size sensitive, despite Google Closure removing unused code.

I propose creating a new source directory for asami.durable (e.g. src-durable) and adding this to the source path for the Clojure build, but not for ClojureScript.