Major refactoring of upb_msg. Temporary functionality regression.

There is significant refactoring here, as well as some more trivial
name changes.  upb_msg has become upb_msgdef, to reflect the fact
that a upb_msg is not *itself* a message, it describes a message.
There are other renamings, such as upb_parse_state -> upb_stream_parser.

More significantly, the upb_msg class and parser have been refactored
to reflect my recent realization about how memory management should
work.  upb_msg now has no memory management, and a memory mangement
scheme (that works beautifully with multiple language runtimes) will
be layered on top of it.

This iteration has the new, read-only upb_msg.  upb_mm_msg (a
memory-managed message class) will come in the next change.

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