Added profiles for custom layouts.

Users can add severals custom layouts and select one of them in recording fragment. The last selected layout is the one that will be use in the next recording.
Fixes #938.

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

@@ -24,7 +24,7 @@ public class UserInterfaceSettingsFragment extends PreferenceFragmentCompat {
 
         Preference customLayoutPreference = findPreference(getString(R.string.stats_custom_layout_key));
         customLayoutPreference.setOnPreferenceClickListener((preference) -> {
-            Intent intent = new Intent(getContext(), SettingsCustomLayoutActivity.class);
+            Intent intent = new Intent(getContext(), SettingsCustomLayoutListActivity.class);
             startActivity(intent);
             return true;
         });