Publish DD M15 v0.18.0

Publish the Data Definition resources for M15 v0.18.0

• Member GitLab schema repository SHA 486046187e92071750f14ccddd596b8e32e4e04d
• Member GitLabl reference-values repository SHA 2d270d0128bea16a2cb623834fc6e2eff487a2d0

Closes #49 (closed)