Add support for unpackaged resources to speed up loads on Android, i.e. so we don't have to decompress entire GPAs to load a single resource.

PortabilityLayer/GPArchive.h

@@ -9,5 +9,8 @@ namespace PortabilityLayer
 		char m_id[13];
 
 		static GpArcResourceTypeTag Encode(const ResTypeID &tag);
+
+		bool Load(const char *str);
+		bool Decode(ResTypeID &outTag);
 	};
 }