Removing NNN address limit

Small change reducing the name limit for NNN addresses
Set/GetLength is not required in packet definition

Including this function in the files was a mistake. I didn't understand how
serialization was working so I guessed the functions were necessary. Turns out
that they aren't, so I am deleting them and all variables related to the
functions.
Serialization complete!

This commit handles all the serialization of the the NULL, SO and DO packets.
I have noticed that a lot of functions repeat, so in a following commit, I will
probably have to separate the definitions in different files. Doing so will
also probably make it easier for future packets to be added.

Will think it over.