Remove application orchestration language features

This is a feature removal not a new feature. Removes the application orchestration language features. The keywords 'application', 'site, 'consumes' and 'produces' will raise a syntax error. Previously they resulted in a deprecation warning. The `export` and `consume` metaparameters will raise a syntax error. Previously they resulted in a deprecation warning. The keywords above are unused in puppet, but they are still reserved, and cannot be used as a custom resource type or attribute name. The environment catalog REST API has been removed, along with supporting classes such as the environment compiler and validators.