Move AccessGen and CodeGenSupport to sane packages

AccessGen is only needed in our .jdbc package, so move it there
and make the API package-level only rather than public.  This way
its not accidentally used by another backend, because its really
quite JDBC specific.

Move CodeGenSuppor to .server package alongside other common code
generation classes, as its used by not only the JDBC based AccessGen
but also by the protobuf CodecGen by overriding JDBC specific output
methods with protobuf based variants of the same function.

Change-Id: I4ef50add4dfbd47dcf2a4fd86a34888d19f9bb20
Signed-off-by: Shawn O. Pearce <sop@google.com>
9 files changed