Add haxe.io.Bytes, about to modify it
Prevent Bytes.toString from being DCE'd, fixes SData problems

Workaround for https://github.com/HaxeFoundation/haxe/issues/1937
See https://groups.google.com/forum/#!topic/haxelang/9ooTC8qrXy0

Hopefully fixed by Haxe 3.1

Fixes SData problems...
Updates for new tink
Expose map() for ReadOnlyList (on HasMany etc)