Connection manager can now open a query window for selected connection.

Query window has now buttons with icons made in the designer for better looks.
Depending on received responses from the database the tabcontrol with the message, data and explain tab
now switches to the appropriate tab.

PgsqlConn.cpp

@@ -236,6 +236,13 @@ bool Connection::connectStart(const char* params)
 	return conn != nullptr;
 }
 
+bool Connection::connectStart(const char * const *keywords,
+				  const char * const *values)
+{
+	conn = PQconnectStartParams(keywords, values, 0);
+	return conn != nullptr;
+}
+
 PostgresPollingStatusType Connection::connectPoll()
 {
 	return PQconnectPoll(conn);