It was required to make it possible to use typedefs in port types.
Types from packages are emitted in `ifdef..`endif instead of package..endpackage.
The purest solution is to keep package..endpackage and emit appropriate prefix.
Also, it would be great to have constants emitted in the same way.
The package emit of types and constants needs to know which names are
from the current type and which are imported from libraries. Rework
the scope handling of those names so that the information is preserved.
Maciej Suminski
Stephen Williams