Increase MG solidpenetration

I did a bit of testing with bots, this is the smallest value that allows me to do meaningful amounts of damage on old-steel-complex though the thinnest walls. Honestly, i don't think it'll affect the gameplay in any meaningful way but it's a nice little feature that might come handy in 1 out of 100 games.

Also fixed ballistic_density.

Simplified some code and renamed variables to make them more clear.

MG currently does 7 damage through the wall around dance when perpendicular, when the angle is more than 45 deg, it doesn't penetrate at all.

The Quake-Newtons despite sounding cool were probably remnants of the old solidpen calculations, they're not used anywhere anymore.

And penetrating clips is because they're used for collisions with crates and some other places (some grating on warfare uses them but only from one side which creates inconsistencies). Xoylent is practically made of them.