Previously, Form and Dialog classes were very similar, and both extended EditorLike.
Now they will have more distinct roles:
BaseDialog is responsible for header with label and description, and footer with the buttons.
Form is only responsible for tabsheet of sections and fields - and for the error panel.

These classes go away: EditorLike, EditorLikeComponentState, EditorLikeComponentConnector, EditorLikeHeaderWidget, EditorLikeActionListener.
Mostly they are migrated into the Dialog classes that used to extend them.