max_size Allocated size for *bytes* and *string* fields.
max_count Allocated number of entries in arrays
(*repeated* fields).
+int_size Override the integer type of a field.
+ (To use e.g. uint8_t to save RAM.)
type Type of the generated field. Default value
is *FT_DEFAULT*, which selects automatically.
You can use *FT_CALLBACK*, *FT_POINTER*,
packed_struct Make the generated structures packed.
NOTE: This cannot be used on CPUs that break
on unaligned accesses to variables.
+skip_message Skip the whole message from generation.
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These options can be defined for the .proto files before they are converted