function hasFormat(codec) {
	return hasAudio() && Howler.codecs(codec);
}
check if the given audio format is supported
@param {"mp3"|"mpeg"|"opus"|"ogg"|"oga"|"wav"|"aac"|"caf"|"m4a"|"m4b"|"mp4"|"weba"|"webm"|"dolby"|"flac"} codec - the audio format to check for support
@returns {boolean} return true if the given audio format is supported