Beginnings of support for constrained types
Programs with constrained types now parse and typecheck, but typestate doesn't check them specially, so the one relevant test case so far is XFAILed. Also rewrote all of the constraint-related data structures in the process (again), for some reason. I got rid of a superfluous data structure in the context that was mapping front-end constraints to resolved constraints, instead handling constraints in the same way in which everything else gets resolved.
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