v0.3.0

• The city is in full color again: what's on the radio stands out by its own light instead of the
  rest being faded (fading is still in City Planning, off unless turned on; it's turned off once
  for anyone who had it from 0.2).
• Each service has its color (police blue, fire orange, EMS pink, transit green…), and its radios
  show it: a ring on the ground under every radio's vehicle (faint when heard lately, pulsing
  while it talks), a trail of sparkles while it talks, dots marching along its route to an
  incident, and a stripe down its name bubble.
• A dispatcher's building, when it talks, glows with rays turning over it and radio rings rising.
• A radio talking behind a building shows through it.
• Fewer background cars (at most four, on light), and no background buses.