Restored vanilla job over-rides. Integrated vanilla updates to them.
Removed some redundant buildings, tech and decisions from the mod.
Carried out first balance pass on civics and civics over-rides.

Removed over-rides of vanilla jobs, which are now all vanilla 3.0.2.

Country over-rides fixed. Related First contact, Crisis Fleet, Juggernauts and Star Eaters enabled.

Restored over-rides to vanilla starbase buildings.
Restored starbase ship-type over-riding and integrated vanilla changes.