Farmbots!

Adding farmbots again. They water, weed and fertilize
Build them by using cyborg arm on a water tank, then plant anaylzer, mini-hoe, bucket, and then prox sensor
Merge pull request #1 from Baystation12/bleeding-edge-freeze

Bleeding edge freeze
Merge branch 'bleeding-edge-freeze' of https://github.com/GauHelldragon/Baystation12 into bleeding-edge-freeze
Merge pull request #2163 from GauHelldragon/bleeding-edge-freeze

Farmbots! Adds new file farmbots.dm