Various country flag improvements

* Added country flags for games from Netherlands and Spain
* Added separate category for Region Free games (Uses European flag as placeholder)
* Added missing country filter options in "show regions" menu
* Rearranged country filters for readability
* Incremented CACHE_REVISION

Also fixed various country filters not showing up as options in the "Show regions" menu.

Source/Core/Core/ConfigManager.h

@@ -63,9 +63,15 @@ struct SConfig : NonCopyable
 	bool m_ListPal;
 	bool m_ListUsa;
 	bool m_ListJap;
+	bool m_ListAustralia;
 	bool m_ListFrance;
+	bool m_ListGermany;
+	bool m_ListInternational;
 	bool m_ListItaly;
 	bool m_ListKorea;
+	bool m_ListNetherlands;
+	bool m_ListRussia;
+	bool m_ListSpain;
 	bool m_ListTaiwan;
 	bool m_ListUnknown;
 	int m_ListSort;