Pascal - Generics - Hashers - Define `TADHasher<T>` types

[LK-Daniel]

Need to define TADHasher<T> as the Abstract Base Class implementing IADHasher<T>.

This basically provides a "concrete class" abstraction for each Hashing Algorithm Implementation.

This Issue also includes the definition of IADHasherBobHoskins<T> and IADHasherFastHash<T> respectively.