Strict field identification in dialog methods

Fields referenced in methods of the dialog class must exist in the current dialog, or an error is raised.

Starting with version 2.20.05, dialog class methods like ui.Dialog.setFieldTouched() can now raise a runtime error -1373 if the field specified does not match a field in the current dialog. Before version 2.20.05, these methods previously ignored the invalid field specification, making it difficult for the programmer to quickly find the mistake.