Add configuration option to allow all imports

[basnijholt]

With every update, I remove a few lines that check whether the import I do is allowed.

Something like

pyscript:
  allow_all_imports: true

[craigbarratt]

Yes, that's a great idea. It's mentioned in the wiki roadmap. I need to figure out how HASS config parameters work, and how to make them work in the UI too.

[craigbarratt]

Thanks for the PR - merged.