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A warning is emitted if the :attr:`.declared_attr.cascading` modifier is used with a declarative attribute that is itself declared on a class that is to be mapped, as opposed to a declarative mixin class or ``__abstract__`` class. The :attr:`.declared_attr.cascading` modifier currently only applies to mixin/abstract classes. Also add a test for @declared_attr.cascading when used on an attribute on __abstract__. Change-Id: Ib1b9dbe373e8be1cf24eadfed224a8988b3cd95d Fixes: #3847