fix: automatic coupler crashes, horns, compressor start delay, radio and cab lever sounds

- automatic couplers don't catch above the safe collision speed (#86): with crash damage on they couple at a
  closing speed of 15 km/h at most, a faster hit locks the coupling until the vehicles part and the collision
  runs its course. On the way: CollisionVelocity() read a head-on 10 + 10 km/h as 14.1 km/h (quaternions turn
  by half the angle), it's now taken from the touching ends; CollisionDetect() took the other vehicle's speed
  the wrong way round for vehicles facing each other. Head-on hits now derail sooner, at the intended limit,
- a single horn lever can't sound both tones at once (eu07/maszyna#392),
- a skid ends once the vehicle stops on locked wheels (eu07/maszyna#479),
- electronic destination signs are blanked at the end of the timetable (eu07/maszyna#446),
- horns need the air or the voltage to sound (eu07/maszyna#290, #76): HornType=[Pneumatic]|Electric and
  Horn3Type in Cntrl.; a pneumatic horn needs 0.2 MPa in the main reservoir (or the main pipe without one),
  an electric one the low voltage; the lever stays where it was put,
- compressor start delay (#67): CompressorStartDelay [s] in Brake., counted from the compressor getting its
  power, after the engine starts say; none by default,
- the channel and volume buttons of a radio without power do nothing (eu07/maszyna#429); the power check of
  the radio is TMoverParameters::RadioPowered(),
- a lever moved smoothly sounds the positions it passes (#83).

Sonar findings in the functions changed: nesting, nested conditionals, commented-out code, std::format,
references to const. Unit tests: test::pair for two vehicles running into each other, test_couplers,
test_horn, test_wheelslip, test_compressor, test_radio, test_gauge_positions.

vehicle/Driver.cpp

@@ -30,6 +30,8 @@ http://mozilla.org/MPL/2.0/.
 #include "world/station.h"
 #include "input/keyboardinput.h"
 
+#include <format>
+
 #define LOGVELOCITY 0
 #define LOGORDERS 1
 #define LOGSTOPS 1
@@ -1093,10 +1095,9 @@ TController::TableUpdateStopPoint( TCommandType &Command, TSpeedPos &Point, doub
             if (Point.fDist < passengerstopmaxdistance * 0.5 ) {
                 // zaliczamy posterunek w pewnej odległości przed (choć W4 nie zasłania już semafora)
 #if LOGSTOPS
-                WriteLog(
-                    pVehicle->asName + " as " + TrainParams.TrainName
-                    + ": at " + std::to_string(simulation::Time.data().wHour) + ":" + std::to_string(simulation::Time.data().wMinute)
-                    + " passed " + asNextStop); // informacja
+                WriteLog(std::format(
+                    "{} as {}: at {}:{} passed {}",
+                    pVehicle->asName, TrainParams.TrainName, simulation::Time.data().wHour, simulation::Time.data().wMinute, asNextStop)); // informacja
 #endif
                 // przy jakim dystansie (stanie licznika) ma przesunąć na następny postój
                 fLastStopExpDist = mvOccupied->DistCounter + 0.250 + 0.001 * fLength;
@@ -1253,10 +1254,9 @@ TController::TableUpdateStopPoint( TCommandType &Command, TSpeedPos &Point, doub
                         TrainParams.StationIndexInc(); // przejście do następnej
                         asNextStop = TrainParams.NextStop(); // pobranie kolejnego miejsca zatrzymania
 #if LOGSTOPS
-                        WriteLog(
-                            pVehicle->asName + " as " + TrainParams.TrainName
-                            + ": at " + std::to_string(simulation::Time.data().wHour) + ":" + std::to_string(simulation::Time.data().wMinute)
-                            + " next " + asNextStop); // informacja
+                        WriteLog(std::format(
+                            "{} as {}: at {}:{} next {}",
+                            pVehicle->asName, TrainParams.TrainName, simulation::Time.data().wHour, simulation::Time.data().wMinute, asNextStop)); // informacja
 #endif
                         // update consist weight, brake settings and ai braking tables
                         // NOTE: this calculation is expected to run after completing loading/unloading
@@ -1297,13 +1297,16 @@ TController::TableUpdateStopPoint( TCommandType &Command, TSpeedPos &Point, doub
                 else {
                     // jeśli dojechaliśmy do końca rozkładu
 #if LOGSTOPS
-                    WriteLog(
-                        pVehicle->asName + " as " + TrainParams.TrainName
-                        + ": at " + std::to_string(simulation::Time.data().wHour) + ":" + std::to_string(simulation::Time.data().wMinute)
-                        + " end of route."); // informacja
+                    WriteLog(std::format(
+                        "{} as {}: at {}:{} end of route.",
+                        pVehicle->asName, TrainParams.TrainName, simulation::Time.data().wHour, simulation::Time.data().wMinute)); // informacja
 #endif
                     asNextStop = TrainParams.NextStop(); // informacja o końcu trasy
                     TrainParams.NewName("none"); // czyszczenie nieaktualnego rozkładu
+                    // koniec kursu, gasimy wyświetlacze relacji (tablice blaszane zostają)
+                    for( auto *vehicle { pVehicles[ end::front ] }; vehicle != nullptr; vehicle = vehicle->Next() ) {
+                        vehicle->DestinationClear();
+                    }
                     // ma nie podjeżdżać pod W4 i ma je pomijać
                     iDrivigFlags &= ~moveStopCloser;
                     if( false == TestFlag( iDrivigFlags, movePushPull ) ) {