Non-helper functions not deconflicted

[Conduitry]

This is a bit of a weird case to handle, because while we do want to rename the applyComputations function if it conflicts with imports, we don't want to just use the existing helper(name) function, as that then adds the function to .uses and we'd try to bring in the shared function by that name, which doesn't exist.

Saving gists seems broken at the moment in the REPL, so here's a quick reproduction:

<script>
  import applyComputations from "./dummy";
  export default {
    computed: {
      a: b => b
    }
  }
</script>

[Conduitry]

This is also going to happen with addCss:

<script>
  import addCss from "./dummy";
</script>
<style>
</style>

I don't think it can happen with anything else. Updating ticket description.

[Conduitry]

Nope, also renderMainFragment.

[Conduitry]

(Also addedCss.)

The easiest way I could think of to handle this is with an extra flag passed to the generator.helper method. I've pushed what I have but haven't submitted a PR. It looks like it works, and it passes all the existing unit tests, but could probably stand a couple new ones.

[Conduitry]

Splitting off the alias generation into a separate method might be nicer than just adding a boolean argument to the existing method.

[Conduitry]

PR #389 submitted, including unit test.