Add prereqs to parcel definitions
Compile cfc with debug flags
Switch from implicit to explicit dependencies

Stop inferring the dependencies from the types used in a parcel. Use the
prerequisites from the parcel definition instead.
Add array of class struct symbols to CFCParcel
Only search prerequisites for unqualified type specifiers

Don't search all classes but only direct prerequisite parcels for
unqualified type specifiers. This avoids potential errors that could
arise from name clashes with classes from unrelated parcels.