Add Formation tab in managements section

[borislav]

I very much like tabs in management view. Especially useful is the blueprint tab for defining new units.
What I'm missing it there is the tab that shows formations, what leads to what and what is required to research to be able to discover creatin formations.
Something like few snaps that Dturtle made at:
https://www.matrixgames.com/forums/view ... 0&t=352634