Implement the farmOS Data Model

[jgaehring]

In the course of implementing both the GUI and JSON serialization methods, we discussed ways that our existing models could be adapted to meet compliance with the farmOS Data Model. Doing so would provide a very nice path for data synchronization with farmOS servers to provide great availability, portability, and if nothing else, a reliable backup service. This would obviously make Runrig and the EWS more attractive to existing farmOS users, but it also loans greater assurances to users seeking an ad hoc solution for the time being, but with an option to migrate to a more robust solution if and when the need arises.

And to my knowledge, this would be the first farmOS implementation written in Rust! 🦀