TEv16 & FEv3 - let's play with R'varna!

Tau Empire v16 & Farsight Enclaves v3 changes:
-> R'varna [FW] added (thanks Kangodo for the tip!)
-> Auto-targeting wording fixed (thanks Gandalf51 for the tip!)

Farsight Enclaves v3 exclusive changes:
-> Signature Systems form Taros Campaign added, as they are questionably legal;