Goal: to create an item such as an ammo pack, which we can trigger to respawn. Place the item normally, give it a
targetname, and add the following key:
That’s it. Pick it up, then fire the trigger, and it will respawn. Have it target itself with a delay of 30 seconds to replicate deathmatch rules. You can be more creative than that though, and have items that respawn after each wave of monsters or each time the player presses a button.