Qt: implement flow layout game grid

This will allow us to properly style the grid and also remove the need to refresh the whole grid on a window resize

rpcs3/rpcs3qt/game_list.cpp

@@ -1,6 +1,15 @@
+#include "stdafx.h"
 #include "game_list.h"
 #include "movie_item.h"
 
+game_list::game_list() : QTableWidget(), game_list_base()
+{
+	m_icon_ready_callback = [this](const game_info& game)
+	{
+		Q_EMIT IconReady(game);
+	};
+}
+
 void game_list::clear_list()
 {
 	m_last_hover_item = nullptr;