Add hooks for encoding/translating of network buffer

[jphickey]

Is your feature request related to a problem? Please describe.
Currently TO_LAB directly forwards the data received from SB onto the network socket.

But in some configurations - particularly heterogeneous environments with mixtures of different CPU types - the data from the socket is not directly representable as a "C" struct.

Describe the solution you'd like
Separate this into a separate source file, and add a hook in TO_LAB to allow the write to the socket to include an encoding step prior to sending on the network. In the default implementation it would be a pass-through as it is today.

Additional context
For example, missions may dictate that all data appear in on the interconnections in "big endian" (network) byte order, and the local CPU might be little-endian, thus it needs to be encoded/translated before being forwarded to the network. This would provide the appropriate hook to allow that to happen.

Requester Info
Joseph Hickey, Vantage Systems, Inc.