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/content/data/Layout.java

@@ -0,0 +1,42 @@
+package de.dennisguse.opentracks.content.data;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class Layout {
+    private final String profile;
+    private final List<DataField> dataFields = new ArrayList<>();
+
+    public Layout(String profile) {
+        this.profile = profile;
+    }
+
+    public void addField(String key, String title, boolean visible, boolean primary, boolean isWide) {
+        dataFields.add(new DataField(key, title, visible, primary, isWide));
+    }
+
+    public void addField(DataField dataField) {
+        dataFields.add(dataField);
+    }
+
+    public void addFields(List<DataField> dataFields) {
+        this.dataFields.addAll(dataFields);
+    }
+
+    public void removeField(DataField dataField) {
+        dataFields.remove(dataField);
+    }
+
+    public List<DataField> getFields() {
+        return new ArrayList<>(dataFields);
+    }
+
+    public void moveField(int from, int to) {
+        DataField dataFieldToMove = dataFields.remove(from);
+        dataFields.add(to, dataFieldToMove);
+    }
+
+    public String getProfile() {
+        return profile;
+    }
+}