Equality, ordering and std::hash support for a type.

Concepts
concept	StormByte::Type::EqualityComparable
	Type whose `==` and `!=` both yield something convertible to `bool`.

concept	StormByte::Type::ThreeWayComparable
	Type whose `<=>` operator is well-formed.

concept	StormByte::Type::Hashable
	Type with a valid `std::hash` specialization.

Equality, ordering and std::hash support for a type.

Concepts