Deniz Evrenci 96f91428c6 Add defaulted copy and move operations to format_error and system_error (#1347) ...

* Avoid weak vtables by providing a private virtual member function

* Add warning Wweak-vtables to clang when FMT_PEDANTIC is on

* Add defaulted copy and move operations to format_error and system_error

Compiler generated copy operations are deprecated and move operations
are not generated altogether.

* Add warning Wdeprecated to clang when FMT_PEDANTIC is on

2019-10-11 10:44:20 -07:00

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