[MERGED PR] Security Vendor Changes

[mralexs]

I don't think the medkit makes a lot of sense. If there's a loadout involving healing or chems in general, I'd like it to be tailored to security, both utility and flavor-wise. For instance, the robust donuts. If security wants a medkit, they can go ask medical. I actually disagree that this is more RP oriented, as it actually reduces interaction and starts security off with gear that only doctors should start with (menders + upgraded health analyzer).

IIRC Police officers usually have first aid kits in the cars IRL, so it does make sense for them to have first aid kits as an option.