Fix MemberPath so that it can exclude overriden members

[Evangelink]

Fix #1077

I think that the method IsSameOrInherits should be updated to use IsSubclassOf instead of AssignableFrom to avoid some potential FPs (assignable checks also for cast not only direct inheritance).

[Evangelink]

@dennisdoomen What do you think about creating a new PR to change IsAssignableFrom to IsSubclassOf?

[dennisdoomen]

What do you think about creating a new PR to change IsAssignableFrom to IsSubclassOf?

I don't quite get why. IsSameOrInherits implies that it'll return true if the type is the same or inherits from it and supports interfaces as well.

[Evangelink]

Current implementation is probably good enough but IsAssignableFrom also handles cast. So if you have type A with property Foo and type B with the same property name and B has the implicit cast operator this would return true.