Intercom hear range (that is, the distance at which it can be heard) changed from 2 tiles to 7 tiles, matching the viewing distance.

Notice boards added to research, security, engineering break room, medbay lobby, HoP's desk, bridge, cargo bay, cargo lobby and mining.
Merge pull request #2522 from RavingManiac/bleeding-edge-freeze

Intercom tweaked and notice boards added