feat(blackbox): the cab panel as fits the vehicle, every switch the driver worked in the events

- The rest of the cab record is read when written: what drives the
  vehicle, the doors' permits and departure signal, the brakes of the
  whole train, a diesel's oil and temperatures, the cruise control and
  the rest.
- Cab panel: the traction as fits what drives the vehicle (voltage and
  current of an electric one; revolutions, oil pressure and temperatures
  of a diesel; clutch or torque converter of a mechanical or hydraulic
  one; nothing for a draisine), the equalizing reservoir, the main
  reservoir pipe and the most braked cylinder of the train, the brakes'
  setting and mode, a group of the doors, the pumps of a diesel where an
  electric vehicle has its pantographs, the hand brake, the releaser, the
  horn's tone, the radio's channel, the integrated handle of a unit.
- Events: every switch on and off, doors opened and closed, the departure
  signal, the hand brake, the brakes' setting, the radio channel, the
  cruise control's speed; moving with the doors open and an overheating
  engine as faults.
- A vehicle with no lamps at an end (a draisine) is not judged on its
  lights, and one which never had a voltage shows none.

StarterNG.Tests/BlackBox/BlackBoxSignalsTests.cs

@@ -108,6 +108,34 @@ public class HeadCodeTests
         Assert.True(fault.TailWrong);
     }
 
+    [Fact]
+    public void What_drives_the_train_and_the_rest_are_read_when_written()
+    {
+        var f = new BlackBoxFile().Info();
+        f.Cab(0, 1, 1000, 40, movement: 1, equippedHead: 0x15, equippedTail: 0x22, engine: 4, oilTemperature: 71.5f);
+        f.Cab(0.5, 1, 1000, 40, movement: 1, equippedHead: 0x15, equippedTail: 0x22);
+        var cab = BlackBoxReader.Read(f.End(1).Stream()).Cab;
+        var extra = Assert.NotNull(cab[0].Extra);
+        Assert.Equal(EngineKind.DieselElectric, extra.Engine);
+        Assert.Equal(3, extra.RadioChannel);
+        Assert.Equal(71.5f, extra.OilTemperature);
+        Assert.Equal(1.0f, extra.Clutch);
+        Assert.Equal(2.5f, extra.ConsistBrakeCylinder);
+        // an older sample has none
+        Assert.Null(cab[1].Extra);
+    }
+
+    [Fact]
+    public void A_vehicle_with_no_lamps_is_not_judged()
+    {
+        var recording = DriveWith(0, 0, 0, 0);
+        Assert.Null(HeadCodes.HeadRight(recording.Cab[0]));
+        Assert.Null(HeadCodes.TailRight(recording.Cab[0]));
+        var summary = recording.Summarize();
+        Assert.Equal(0, summary.LightsJudgedSeconds);
+        Assert.Empty(summary.LightsFaults);
+    }
+
     [Fact]
     public void A_vehicle_with_all_the_lamps_is_to_light_all_three_for_Pc1()
     {