v0.5.1

• Follow stays with the radio it's on until its transmission is over, whoever else keys up
  meanwhile, then goes on to the next one on the air after a moment. With Listen on, it stays with
  the radio on the speakers, until the speakers move on to another call; before, a new call (even
  an encrypted one, with nothing to hear) took it away from the one playing.
• Dispatchers are found by "Disp" anywhere in a radio's name or the alias heard on the air (DISP1,
  PD-Disp, FireDispatch, Dispatcher 4), and become their building even when the name comes after
  the radio was first heard.
• Fixed: a radio on two calls at once (a patched talkgroup, or a call that hadn't closed yet when
  it keyed up on another) stuttered in place, sent back and forth between the two each time the
  recorder updated. It stays with the call it's on until that ends.
• A vehicle sent somewhere new finishes the stretch of road it's on, instead of jumping back to
  where the stretch began, and slides over to its new lane.