Version 0.1.0
The first version.
Features:
* Primitive type erasure concepts for lockable types.
* Pointer type erasure concept.
* Concept for a pointer or pointer-like to type implementing arbitrary
concepts.
* Concept for a weak pointer weak-pointer-like to type implementing
arbitrary concepts.
* Concrete type erasure types for pointer- and weak-pointer-like objects
pointing to lockable objects.