classes are now uppercase and in their own files. lowercase classes are deprecated.
Interfaces are now actual interfaces that should be implemented instead of creating and returning an ai Object every time
(cherry picked from commit 5e3c67a5cf)
- web-components do not implement it
- et2-textarea / SlTextarea uses resize as a property name
--> we can postpone the decision, if we need an explicit resize handler for our web-components, or using flex is sufficient, for now
