Re-abstracts where we grab data when it's access should be limited to the main thread

[orta]

I had a meeting get cancelled, so I used my free hour to try and address #19

After this there are issues running the demo app. Alas, I haven't got tests running yet though, been a bunch of Xcode updates in the last 4 years :D

Will come back for the tests sometime

/cc @alloy @dblock