Reader support for quote, unquote(-splicing), syntax-quote, deref
Compile Clueless for node.js, not the JVM

As of this commit, Clueless is itself compiled to JavaScript – an
important step towards becoming truly self-hosting, since we can
now eval emitted JS at compile-time (within the compiler's own
environment) in order to handle macros, as well as begin writing a
version of the compiler that can correctly compile every feature
used within its own codebase.