Revert "Don't emit SugarCube macros from App.UI.link, but pre-parse them into properly annotated HTML anchors that match what the macro would have done (and yes, that really is what it does; I was surprised too)."

This reverts commit aec4b371.

Don't emit SugarCube macros from App.UI.link, but pre-parse them into properly annotated HTML anchors that match what the macro would have done (and yes, that really is what it does; I was surprised too).