Remove factoryType property from Adic.IFactory

[intentor]

A factory can create different types related to the same type, so not necessarily a factory creates a single type. So, this property doesn't always indicate the correct type being created by the factory - and it should not be a restriction for anyone using factories.

Also, given the framework doesn't use the factoryType property in all situations when dealing with factories, it's better to remove the property.

The removal of the property won't cause problems to any existing factory - it'll be safe to remove it from any existing code.