gnu: Properly move lisp libraries to lisp-xyz, uglify-js to javascript and stumpwm...

gnu: Properly move lisp libraries to lisp-xyz, uglify-js to javascript and stumpwm to wm.

* gnu/local.mk: Include lisp-xyz.scm.
* gnu/packages/lisp-xyz.scm: New file.
* gnu/packages/lisp.scm: Move all lisp libraries to lisp-xyz.scm, uglify-js to
  javascript.scm and stumpwm to wm.scm.
* gnu/packages/javascript.scm: Add uglify-js.
* gnu/packages/wm.scm: Add stumpwm.
* gnu/packages/bioinformatics.scm: Find uglify-js in javascript.scm.
* gnu/packages/machine-learning.scm: Depend on lisp-xyz.scm instead of lisp.scm.
* gnu/packages/web.scm: Find uglify-js in javascript.scm.
* gnu/packages/web-browsers.scm: Depend on lisp-xyz.scm instead of lisp.scm.
* guix/build-system/minify.scm (default-uglify-js): Find uglify-js in
  javascript module instead of lisp.