Package structure: moved models and database.

Part of #963.

src/androidTest/java/de/dennisguse/opentracks/util/EGM2008UtilsTest.java

@@ -1,5 +1,8 @@
 package de.dennisguse.opentracks.util;
 
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotEquals;
+
 import android.content.Context;
 
 import androidx.test.core.app.ApplicationProvider;
@@ -16,10 +19,7 @@ import java.io.InputStreamReader;
 import java.nio.charset.StandardCharsets;
 import java.time.Instant;
 
-import de.dennisguse.opentracks.content.data.TrackPoint;
-
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertNotEquals;
+import de.dennisguse.opentracks.data.models.TrackPoint;
 
 @RunWith(JUnit4.class)
 public class EGM2008UtilsTest {

src/androidTest/java/de/dennisguse/opentracks/util/StringUtilsTest.java

@@ -45,8 +45,8 @@ import java.util.Locale;
 import java.util.TimeZone;
 import java.util.stream.Collectors;
 
-import de.dennisguse.opentracks.content.data.Distance;
-import de.dennisguse.opentracks.content.data.Speed;
+import de.dennisguse.opentracks.data.models.Distance;
+import de.dennisguse.opentracks.data.models.Speed;
 
 /**
  * Tests for {@link StringUtils}.

src/androidTest/java/de/dennisguse/opentracks/util/TrackNameUtilsTest.java

@@ -26,11 +26,10 @@ import androidx.test.ext.junit.runners.AndroidJUnit4;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
-import java.time.LocalDateTime;
 import java.time.OffsetDateTime;
 
 import de.dennisguse.opentracks.R;
-import de.dennisguse.opentracks.content.data.Track;
+import de.dennisguse.opentracks.data.models.Track;
 import de.dennisguse.opentracks.settings.PreferencesUtils;
 
 /**