Recording stats layout customizable.

Users can select the order, visibility and importance (primary or secondary) of all stats for recording layout from the Settings.
Also, users can select the number of columns per row in the recording layout: 1, 2 or 3.
Finally, show altitude/coordinate from settings have been removed (not needed anymore).
Fixes #659.
Fixes #302.
Fixes #820.

src/main/java/de/dennisguse/opentracks/settings/SettingsActivity.java

@@ -208,6 +208,13 @@ public class SettingsActivity extends AbstractActivity implements ChooseActivity
                             }
                     );
 
+            Preference customLayoutPreference = findPreference(getString(R.string.stats_custom_layout_key));
+            customLayoutPreference.setOnPreferenceClickListener((preference) -> {
+                Intent intent = new Intent(getContext(), SettingsCustomLayoutActivity.class);
+                startActivity(intent);
+                return true;
+            });
+
             announcementsFrequency = findPreference(getString(R.string.voice_frequency_key));
             announcementsSpeed = findPreference(getString(R.string.voice_speed_rate_key));
             updateVoiceAnnouncements();