Remove some unnecessary explicit defaulted copy ctors to cleanup -Wdeprecated-copy

Remove some unnecessary explicit defaulted copy ctors to cleanup -Wdeprecated-copy

These types also wanted to be/were copy assignable, and using the
implicit copy ctor is deprecated in the presence of an explicit copy
ctor.

Removing the explicit copy ctor provides the desired behavior - both
ctor and assignment operator are available implicitly.

Also while I was nearby there were some missing std::moves on shared
pointer parameters.