Cleanup: use Java17' Records.

Fixes #1526.

src/main/java/de/dennisguse/opentracks/data/models/Distance.java

@@ -7,12 +7,11 @@ import java.util.Objects;
 
 import de.dennisguse.opentracks.settings.UnitSystem;
 
-public class Distance {
+public record Distance(double distance_m) {
 
     public static Distance of(double distance_m) {
         return new Distance(distance_m);
     }
-
     public static Distance of(Double distance_m) {
         if (distance_m == null) {
             return Distance.of(Double.NaN);
@@ -20,11 +19,9 @@ public class Distance {
             return Distance.of((double) distance_m);
         }
     }
-
     public static Distance of(String distance_m) {
         return of(Float.parseFloat(distance_m));
     }
-
     @Nullable
     public static Distance ofOrNull(Double distance_m) {
         if (distance_m == null) {
@@ -65,12 +62,6 @@ public class Distance {
         };
     }
 
-    private final double distance_m;
-
-    private Distance(double distance_m) {
-        this.distance_m = distance_m;
-    }
-
     public Distance plus(@NonNull Distance distance) {
         return new Distance(distance_m + distance.distance_m);
     }
@@ -142,27 +133,6 @@ public class Distance {
         };
     }
 
-    @Override
-    public boolean equals(Object o) {
-        if (this == o) return true;
-        if (o == null || getClass() != o.getClass()) return false;
-        Distance distance = (Distance) o;
-        return Double.compare(distance.distance_m, distance_m) == 0;
-    }
-
-    @Override
-    public int hashCode() {
-        return Objects.hash(distance_m);
-    }
-
-    @NonNull
-    @Override
-    public String toString() {
-        return "Distance{" +
-                "distance_m=" + distance_m +
-                '}';
-    }
-
     // multiplication factors for conversion
     private static final double KM_TO_M = 1000.0;
     private static final double M_TO_KM = 1 / KM_TO_M;