orca update; ammo increased 5 -> 6. heli sight++

Orca ammo reduced from 10 to 5, since 
Increased toal ammo from 5 to 6, since orcas seem to be a bit weak vs. tanks, flame tanks, etc.
Apache Helicopter & Orca sight range increased from 8 to 10. Seems good here, I wouldn't increase anymore, or they will be too good at scouting by themselves. Leaving it here requires using other units for their scouting value.
A-10 sight range increased from 8 to 12. This makes the airstrike better for scouting, and seems to make sense for an airplane. Since it's a superpower, won't be too powerful.