[MERGED PR] Gives captain a mindshield

[Fuppy]

I think for this PR to become permanent it needs the health alert section of the implant removed. I agree with stopping the mindhack from being easy to instantly use on powerful roles, but the health alert makes it next to impossible to kill a captain and get away with it

I think Glowbold's suggestion is a good balance to this. making it so only command get alerted, so you have to just hope that one of the heads is paying attention in that moment. or that they're even able to get a hold of security because they very well may be preoccupied with other (seemingly) more pressing things.