Release v3.0.0-rc.3

Release v3.0.0-rc.2

Release v3.0.0-rc.1

[BUGFIX] Fix aircrafts in timewarp mode

I believe we had these minor problems:

* We assumed that there are always useful downloaded Whazzups for Time
  Warp mode.
* We relied on Qt signal auto connections and probably failed to
  disconnect them in times where we want to inhibit the handlers.

This part of QuteScoop is pure recursive brainfuck. Anyways it seems to
run smoother now and the original problem is gone.

Fixes: #224

[TASK] add even more controller -> airport assignments (#229)

[FEATURE] React to hovering and clicking DEL/GND/ATIS (#228)

This visually highlights GND/DEL when hovered and it adds all 3 of them
to the selection list after clicking near an airport.

[FEATURE] (Re-)add position to controllers (#222)

With the new VATSIM status data format we lost the lat/lon position of
controllers. We use it to pan and zoom the map to a controller when
"Show on map" is clicked in the controller detail dialog.

This adds the airport position(s) as controller position.

[BUGFIX] Fix initial date in booked ATC dialog (#216)