Replace Includes With Forward Declarations

[Behemyth]

Headers should not be included when a forward declaration suffices. If an #include is used for just a signature such as

• void PushBack(const Dog$);

• Dog* dog

  and not as a storage requirement such as

• Dog dog;

then the #include can be moved to the *.cpp file and a forward declaration used in its place class Dog;

[Behemyth]

Some changes by Ryan in PR #241 . There is more to be done, so I'm leaving the issues open.