NOTE: This cannot be used on CPUs that break
on unaligned accesses to variables.
skip_message Skip the whole message from generation.
+no_unions Generate 'oneof' fields as optional fields
+ instead of C unions.
+msgid Specifies a unique id for this message type.
+ Can be used by user code as an identifier.
============================ ================================================
These options can be defined for the .proto files before they are converted