Rebel and Empire mini-mod

The Rebels get The Republic Stealth ship at level 3,4&5 in both GC and skirmish. The seismic tank and the T4C battle tank are only build able at the heavy vehicle factory in GC and skirmish.
This mod gives the Empire and Rebels new units. The Empire gets The Dragon star destroyer and the galaxy star destroyer at a level 4&5 space station in GC and at a level 5 space station in skirmish .