Also made proper namespacing work for enums.

You can now say namespace.MyTable as the type when declaring
a field that refers to a type in a different namespace.

Previously, it would work just referring to MyTable, however
with the recent commit fixing namespaced types this now
is ambiguous.

Change-Id: Ieaa3f4ac1662b8c4dc1f16e1898ea3cdb02e10fd
Tested: on Linux.