USA vehicle changes

Ectar: M46 Patton: Dispersion on the move for M46T80E1 suspension decreased by 7%. Dispersion on hull traverse for M46T80E1 suspension decreased by 7%. Dispersion on the move for M46T81 suspension decreased by 8%. Dispersion on hull traverse for M46T81 suspension decreased by 8%. Dispersion for 105 mm Gun T5E1M2 on turret traverse decreased by 14%. Dispersion for 105 mm Gun T5E1M2 changed from 0.42m to 0.4m. Dispersion for 105 mm Gun T5E1M2 on turret traverse decreased by 17%. Dispersion for 105 mm Gun T5E1M2 changed from 0.42m to 0.4m. M8A1: Armour arrangement adjusted to be more accurate (minor changes).