2.2.0

• Feature: Add modelOptions.useSourceDirectoriesAsNamespaces project option to disable namespaces and allow slashes in file names without special semantics
• Feature: Ad subscription to meta schema (just emits the schema once - but if you switch out the schema on model change, you get an effective subscription)
• Improvement: Run UniqueEnumValueNamesRule validation rule on project sources
• Improvement: Warn about lowercase enum values (they violate the style guide)
• Bugfix: Reject invalid enum values true, false, and null (they would otherwise error on schema creation)