cnc - Weapon adjustments & balance. Rockets,apc...

Flame tank buffed. Slower ROF, higher damage. Still relatively poor vs. heavy armor.
Stealth tank rockets buffed vs. heavy. Firing rate increased. Burstdelay added. Rocket speed slightly increased.
BikeRockets buffed vs. heavy. Dmg fixed so it doesn't one-shot artillery and two-shot humvee. Rocket speed slightly increased
MachineGun fixed--damage vs. vehicles and buildings was abysmal. Still fairly low vs. heavy armor & wood.
Grenade speed increased 5 -> 8 (Original value from C&C)
APC Gun nerfed vs. heavy armor, so that it is not a "light tank".
E3 Rockets buffed vs. light (to increase effectiveness vs. helis and humvees). Turn rate increased so they don't fly in circles vs. helis.