SharedObject: delete unused methods

[Al2Klimov]

None of the derived classes use them, none shall have to explicitly delete them.

[Al2Klimov]

Wanted to do this for the new StoppableWaitGroup requested in #10397 (comment), but thought:

[Al2Klimov]

what do they even exist for?

[jschmidt-icinga]

You don't need to delete the move constructor and assignment operator when the copy constructor and assignment operator have already been deleted (or defined non-default).

See here:

If the definition of a class X does not explicitly declare a move constructor, a non-explicit one will be implicitly declared as defaulted if and only if

• X does not have a user-declared copy constructor,
• X does not have a user-declared copy assignment operator,
• X does not have a user-declared move assignment operator, and
• X does not have a user-declared destructor.

An equivalent rule exists for the operator, here.

So I agree absolutely with removing the definitions for shared object and defining the copy-constructor and copy-assignment operator as deleted, but for Object no change is needed.

[jschmidt-icinga]

The move constructor and move-asignment operator deletes are still unnecessary.