- Fixes a crash when used in a GridLayout on iOS since the layout needs to be
notified of any layout children changes.
- Adds a _parentChanged hook for all views.
- Use relative imports in place of most of our absolute ones.
- Add "private" ambient modules for modules that we need to import using
an absolute path (e.g. when app/.../test-something.ts needs to import
ui/styling/style-scope)