Generics: Schema parser.
Generics: Schema/dynamic API support.
Generics: Rename some things better. (Hardest problem in computer science.)
Generics: Refactor NodeTranslator and fix alias evaluation.

More refactoring is needed, but this at least makes "using" aliases work correctly with generics.
Delete some obsolete TODOs.
Generics: Fix compiler error test and test for new errors.
Merge branch 'master' of github.com:kentonv/capnproto
Tweak EZ RPC ReaderOptions docs.