Add IsValidWeapon native (#1009)

[shierru]

Unfortunately I haven't figured out how to properly make the changes in the SDK.

I hope you can help me :)

[NoPressF]

This is an incorrect check for the validity of weapons because there are no weapons that have an ID (19, 20, 21, 47, 48, 52)

[NexiusTailer]

This is an incorrect check for the validity of weapons because there are no weapons that have an ID (19, 20, 21, 47, 48, 52)

It's not weapons, it's damage reasons. Moreover 19-21 aren't valid both as weapons or reasons