Add nullptr_t overload to AnySharedPointer
Add nullptr_t overload to AnySharedPointer

Should be allowed, sometimes there are runtime settings where `nullptr_t` is desired.

leapmotion/autowiring,codemercenary/autowiring,leapmotion/autowiring,leapmotion/autowiring,codemercenary/autowiring,codemercenary/autowiring,leapmotion/autowiring,leapmotion/autowiring,codemercenary/autowiring,leapmotion/autowiring,codemercenary/autowiring,codemercenary/autowiring