New Role: Security Radio Operator

[jan.antilles]

I don't think Security needs another role. I'm fine with assigning a Secass to do it, or having the HoS do it, or just having equipment sit at the front desk in Sec so that whoever is manning the desk can speak over the Dispatch Mic (bigger text over Sec frequencies? switchable to general radio so Sec can make announcements?) and so antags can do it too to be cheeky