[+FEATURE] Extbase (Persistence): Implemented a second Lazy Loading strategy called...

[+FEATURE] Extbase (Persistence): Implemented a second Lazy Loading strategy called "storage". In contrast to the LazyLoadingProxy it is a StorageObject which loads its internal storage array lazy. This enables the framework to intercept count($propertyValue). Furthermore, you don't have to load the real instance inside your domain model class. Related to #3596.
[+BUGFIX] Extbase (Persistence): It is now possible to pass an object as operand of a comparison.