Introduced the MasterController as part of working on loading catalogue information.

Need a central piece to manage the catalogue data per database to prevent loading
this multiple times. MasterController is now also used to enable reopening the
connection manager from a query window after the connection manager has been closed.

opendatabase.h

@@ -0,0 +1,32 @@
+#ifndef OPENDATABASE_H
+#define OPENDATABASE_H
+
+#include <QObject>
+#include "connectionconfig.h"
+#include "expected.h"
+
+class PgsqlDatabaseCatalogue;
+
+class OpenDatabase : public QObject
+{
+	Q_OBJECT
+public:
+	static Expected<OpenDatabase*> createOpenDatabase(const ConnectionConfig &cfg);
+
+	OpenDatabase(const OpenDatabase &) = delete;
+	OpenDatabase& operator=(const OpenDatabase &) = delete;
+	~OpenDatabase();
+
+signals:
+
+public slots:
+
+private:
+	ConnectionConfig m_config;
+	PgsqlDatabaseCatalogue *m_catalogue;
+
+	OpenDatabase(const ConnectionConfig& cfg, QObject *parent = 0);
+	bool Init();
+};
+
+#endif // OPENDATABASE_H