* make 'if' into a macro that always gets included, and that generates a 'cond'
* make 'function' into a macro that aliases to 'lambda'
* Don't ignore .loop files
add let as a built-in
ws
remove unnecessary deep copies
Allow raw js to be evaluated with __loop_js_eval__
pending spec: lambda should always return its last argument
add __loop_include__ macro to include files