Remove EntryFactory Interface

[norberttech]

Since the beginning of this project I never had a single use case to replace NativeEntryFactory with a different implementation, I also never heard from anyone that he needs it.

With new features like #1396 keeping EntryFactory as an Extension point makes that one extremally risky and fragile due to high complexity of that mechanism.

Lets remove EntryFactory interface and rename NativeEntryFactory into EntryFactory