[SUGGESTION] Replace HE mechanics

[Stooberton]

Short Description
Solves #11 since sv_acfdamage is producing most of the errors.

Remove the disgusting block of code that is ACF_HE. Replace with two separate damaging functions, ACF_Frag and ACF_Overpressure.

Instead of the death-sphere provided by ACF_HE, replace it with ballistic fragment projectiles. Giving something a like 203mm HE at the high end of 1000-2000 fragments is still less than the amount of traces put out by 203mm HE currently.
ACF_Overpressure ideally would flood fill but that is probably way too expensive. Instead, pathfinding to players and scaling pressure via the length of the path should give good results. Damaging players around obstacles is possible with this method.

References (Optional)

https://www.youtube.com/watch?v=gGj_ioyZaIk