refactor: weapons that damage player synced more efficiently with server

[Manason]

• changed to a set (table<hash, boolean>) for more efficient lookups
• renamed variable to be more descriptive
• removing client side exports for reviving as this should originate from the server
• syncing less data to the server (only when a new weapon damages a player it sends that one only instead of all previous weapons)
• removed unneeded callbacks. i.e. the server asks the client to revive themselves, and clears the set rather than have the client callback to the server to do it