Rvalue copy constructor: dcpp::shared

Rvalue copy constructor: dcpp::shared_device

Rvalue copy constructor of dcpp::shared_device: move underlying device of temporary dcpp::shared_device object to the new created object.

constructor-12

Calling Sig:

shared_device(const self_type && other__);

Rvalue copy constructor of dcpp::shared_device will move the underlying device of other temporary object to the new created object, the device of other temporary object will be dereferenced.

The other temporary object of dcpp::shared_device: underlying device is dereferenced, reference counter is set to zero.
If the underlying device of other temporary object has been bound to many objects, all reference counter of them will be set to zero.
The new created object of dcpp::shared_device: reference to the moved underlying device, reference counter is set to one.
If other__ has invalid underlying device or other__'s reference counter is zero, the new created object's reference counter keeps zero.

Rvalue constructor is experimental, it is not allowed at the first time,
Then it is added, removed, and added again.
Rvalue constructor should be used carefuly in a video driver that does not well support multithreading programming.
I might remove it again if a more well reason is found in the future.

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