Smoke and explosions need some tweaks

[subset]

Seem a bit overdone in several areas:

1) Exploding tanks have too high velocity smoke coming out of them when they are initially nurning. Also the smoke disapates at too low of an altitude. Much better to have smoke coming out of the tank more slowly and drifting higher.

2) Tank muzzle smoke. From the gunner view, it obscures the target too much so you can not see the impact of the round for short to medium ranges.

3) When bombs explode, there are a handfull of square 'bits' that fly out. They are too big and the trajectories are odd. Should be smaller and a darker color, at least, and mybe trailing smoke.