[CNC] Tanks now require Repair Bay as pre-requisite.

Tanks now require Repair bay:
Made GDI Medium tank and Mammoth Tank require FIX. 
Made Nod Light Tank and Stealth Tank require FIX.

Not sure yet if Nod's Flame Tank should require Communications Center + FIX. Time will tell.

-Touched up palette build orders.
-Cleaned up the document (changed order of entries), for ease of editing.