Allows to encode/decode String and bytes using Base64 encoding.
staticread onlyBYTES:Bytes = haxe.io.Bytes.ofString(CHARS)
staticread onlyCHARS:String = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
staticdecode (str:String, complement:Bool = true):Bytes