Large refactor.
- Move some simple parenscript utilities into ps-modules
- Introduce ps-modules, a way to define both 3rd party and out own modules
- Revise a lot stuff to use the new ps-modules architecture.
- Generate javascript files from ps-modules' javascript-code-modules, commit them.
- the javascript-code-modules dw (for display window) is where we are now accumulating
  the functionality; this is in dw.lisp