Complete all TODOs in the specification
Complete all TODOs in the specification

Along with legitimate additions to the text, I've also removed
lots of wishful thinking that's not essential for the initial release.

MasseGuillaume/scalameta,scalameta/scalameta,xeno-by/scalameta,olafurpg/scalameta,olafurpg/scalameta,scalameta/scalameta,scalameta/scalameta,olafurpg/scalameta,MasseGuillaume/scalameta,scalameta/scalameta,xeno-by/scalameta,scalameta/scalameta,xeno-by/scalameta,MasseGuillaume/scalameta