So back to the importlib approach due to bugs with symbols vanishing due to my funky compile setup.
Use relative imports again.
Rename to _base so it doesn't get loaded as a template file.
Switch brix to the new TemplateLibrary code and rework the templates to match.

Moving my revamped region stuff over to a subfolder until I have cycles to fix them up. Also just leave the substacks in legacy_region commented until I can deal with them.