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Universal Npcs Knockback System

What this addon does is basically make that npcs doesn't need to have an exterior implementation for them to have knockback, for example the Tank Snpc from Left 4 Dead, when he hits a npc it flies away, but other npcs and nextbots maybe doesn't have the knockback inside of its coding, so this addon make that any damage that the npc receives make for it to have a knockback, depending on the damage amount, the larger the damage is, more far the npc fly.

To enable/disable
npc_knockback_system 1/0

To add and remove npcs from the knockback list, that should not receive knockback, strider and sniper disabled by default.
npc_knockback_list_add <npc>
npc_knockback_list_remove <npc>