js: Consolidate and re-implement the load() function

This replaces the two sloppy copies of the load() function with a
cleaned up implementation:

- Only use the first argument, to load multiple files just call the
  function multiple times
- Fix a crash when using any non-string argument
- Throw an error if the file can't be opened instead of logging to
  stderr
- Don't use parse_and_run(), which would print the AST of the loaded
  file when using -A, for example - it's used either way as the entry
  point in both REPL and non-REPL mode, so we already get exception
  handling and all that

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