continuous-integration/drone/push Build is failingDetails
Also move the signature of the semantic sort TYPE into its own
file to facilitate sharing between Statix and Stratego.
(Currently it is shared via symbolic link, but that may cause
problems down the line; if/when it does, will have to look at
physically copying the file into src-gen via an "Additional
build step" using either Stratego or Ant.
Also documents using Statix types from Stratego.
