js: remove automatic function -> closure conversion

It's a bad idea for several reasons:

* it's inefficient; must allocate an environment for a closure in Nim,
  even though we already have one in JS
* writing macros for automatically creating functions with variadic
  arguments is suprisingly difficult (see the entire `js/javascript'
  module)
* it never really worked properly, because we never freed the associated
  function pointer.

We hardly used it anyway, so the easiest fix is to get rid of it
completely.

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