typeck/kind -- stop using old trait framework.

- Unify the "well-formedness" checking that typeck was already doing with what
  was taking place in kind.
- Move requirements that things be sized into typeck.
- I left the checking on upvars in kind, though I think it should eventually be
  refactored into regionck (which would perhaps be renamed).

This reflects a general plan to convert typeck so that it registers
obligations or other pending things for conditions it cannot check
eventually. This makes it easier to identify all the conditions that
apply to an AST expression, but can also influence inference in somec
cases (e.g., `Send` implies `'static`, so I already had to promote a lot
of the checking that `kind.rs` was doing into typeck, this branch just
continues the process).

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