Gracefully handle the case where the schema contains types from a newer version of Cap'n Proto that we don't know about yet.

Don't trust trusted messages so much.  Just trust that the pointers are valid and in-bounds, but don't assume the data matches the schema.  This makes it easier to safely create a 'trusted' message: just copy any message into a MessageBuilder, and if it ends up all in one segment, it's safe to use.

totalSizeInWords() method on generated struct readers/builders returns total size of the struct, not counting far pointer overhead.  Useful for allocating space for a flat copy.  Also a couple misc tweaks.

Implement ability to set() struct and list fields by deep-copying from a corresponding Reader.  This copy requires no schema knowledge.

Mass rename 'reference' -> 'pointer'.  Been meaning to do this for a while -- all the documentation talks about 'pointers', not 'references'.

When an under-sized struct is found while traversing a builder, upgrade it to the expected size.  This is needed to allow easy copying from readers to builders.  Next, this will need to be implemented for lists as well.

Nope, Red Carpet does NOT work.  Back to Maruku, which also does not work, but in a way that is easier to work around.

Revamp dynamic struct getters/setters to not distinguish unions.  Add converience versions that take string names.

Dynamic API mostly done...  not tested.  This commit actually starts embedding the schema data in the generated code.

Restore ability to upgrade from List(Bool) to List(T) where T is a struct whose @0 field is of type Bool.  I previously disallowed this to reduce complexity, but it turned out to actually increase complexity.

Starting on dynamic message manipulation (manipluating messages without knowing the schema, or without compiling in the schema).