Added a ModelItem class to hold the data for each row.

model/modelitem.cpp

@@ -0,0 +1,8 @@
+#include "modelitem.h"
+
+ModelItem::ModelItem(const QHash<int, QVariant> values)
+    : m_values(values) {}
+
+QVariant ModelItem::data(int role) const { return m_values.value(role); }
+
+bool ModelItem::setData(const QVariant& value, int role) {}