add initial reference invalidation

+ Makes vec example actually memory safe, which is cool

+ Specify owner > sub relationships with ">" in closure parameter
  lists, uses the same group idea as closure calls

+ Relies on users implementing functions in a consistent manner,
  since you can kind of do whatever with pointers. Presumably
  there would be a stdlib of vec/map/set etc. which applications
  could then use and by proxy be memory safe. Although some more
  checks wouldn't hurt, I suppose?

+ Not sure I like having reference invalidation be 'just a move',
  seems to work alright but the semantics of it are a bit muddy.

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