Tweak assault rifle projectile explosion visuals.
Get rid of "superblaster" mutator.
Change minigun bullet spread according to zoom level.
Remove duplicate laser trail from Blaster 4's projectile.
Change minigun projectile sounds & visuals.
Tweak minigun projectile explosion visuals.
Revert "Remove duplicate laser trail from Blaster 4's projectile."

This reverts commit 8d85991c3b5501bbff55695c2970334f20016c2f.
Tweak minigun impact explosion visuals.
Add a couple of new texture files.