Search is now handled by TrackListActivity and MarkerListActivity.

* data is loaded via cursor,
* removed custom ranking (handled in database),
* search text is wrapped with wildcards, and
* search view can be closed by back button.

Fixes #492.

src/main/java/de/dennisguse/opentracks/MarkerDetailActivity.java

@@ -113,7 +113,7 @@ public class MarkerDetailActivity extends AbstractActivity implements DeleteMark
     }
 
     @Override
-    public void onDeleteMarkerDone() {
+    public void onMarkerDeleted() {
         runOnUiThread(this::finish);
     }