1.6.20

• Loader: Better support for facade packages
• Validator: Improved handling of display validation for various languages
• Validator: fix xml:space message after discussion on Zulip
• Renderer: ValueSet rendering improvements
• Renderer: Fix up conceptMap rendering (remove spurious summary table)
• Renderer: Various Rendering fixes for implementers
• Renderer: improve rendering of bindings with no value sets
• Publication Process: refuse to publish packages with dependencies to current or dev