[Z:R] Implement Hitgroup Knockback config, Zombie Class specific knockback config.

[nuclearsilo583]

• Update weapons knockback config to use up to 2 decimals (from 0.0f to .2f).
• Add hitgroups feature like in old Zombie:Reloaded for more control in handling knockback. (Tested offline with bots and worked fine. Need test on full server).
• Update "knockback" config in playerclass.jsonc (why adding this? Because zombie hitboxes are not the same due to difference in zombie model. Which could cause big model with big hitboxes become more disadvantage than other small model)

[Kxnrl]

hello? why still using KeyValues

[nuclearsilo583]

sorry. It's my bad that I only know how to use KeyValues. I don't know how to use .jsonc. It would be great if someone has more experiences to help my bad code.

[Vauff]

Should be fine, it's unlikely we'll ever migrate all our old cfgs away from KeyValues anyways, and this file is simple enough that JSON arrays should never be needed. That was really the only reason we justified the playerclass migration.

[Runo231]

I test this in my server and work so nice +1 to merge

[Runo231]

Works fine lfm

[Vauff]

Thanks, and sorry for the delay, none of the "dev servers" wanted to use this feature so it got a bit sidelined. I've updated the PR to be in line with code changes that have happened in the meantime, and simplified the config format, as I felt it was a bit verbose.

• Update weapons knockback config to use up to 2 decimals (from 0.0f to .2f).

Any number of decimal places should already work, this is actually just the default value if parsing fails. This did bring to my attention that they should probably default to 1.0 though, so I went ahead and did that.