West = Custom Channel (mic off, speaker off)
North = Common Channel (mic on, speaker on)
East = Private Channel (mic off, speaker on) //No change
The old system had two intercoms on the common channel, one with the mic on/speaker off and one with the mic off/speaker on. Apparently it was too confusing for players to figure out that when they changed the freq for one, they'd have to change the speaker/mic of the other. Fixes issue 837.
I've also fixed a derp with fire extinguishers I made in my last commit.
git-svn-id: http://tgstation13.googlecode.com/svn/trunk@4548 316c924e-a436-60f5-8080-3fe189b3f50e