Make weapons using blaster as secondary attack load settings from blaster

Make so that weapons using blaster as secondary attack load settings directly from blaster instead of loading their own blaster settings

It implements Balance Council vote 18 "Keep secondary/offhand blaster default settings (including vaporizer, ok*) the same as vanilla blaster defaults"

Remove optional blaster secondary attack (copy of primary attack with slightly different settings)

After blaster secondary attack removal, Overkill weapons and Vaporizer will use blaster primary settings, meaning their secondary attack force will change from 360 to 375.

This MR includes commits of !1281 (merged) and basically reverts the meaningful balance changes contained there ("Vaporizer secondary force will change from 360 to 480")