added FLAC support

lib/filesystem/ResourceID.cpp

@@ -110,6 +110,7 @@ EResType::Type EResTypeHelper::getTypeFromExtension(std::string extension)
 			(".AVI",   EResType::VIDEO)
 			(".MP3",   EResType::MUSIC)
 			(".OGG",   EResType::MUSIC)
+			(".FLAC",  EResType::MUSIC)
 			(".ZIP",   EResType::ARCHIVE_ZIP)
 			(".LOD",   EResType::ARCHIVE_LOD)
 			(".PAC",   EResType::ARCHIVE_LOD)