Prohibit unused copy ctor & operator=

[EstherWx]

Class 'GenericRegex' and struct 'Foo' have dynamic memmory/resource allocations but no copy constructor and operator=.

And, class 'GenericRegex' has members of type 'Stack', whose copy constructor and assignment operator are prohibited. Struct 'Foo' is only used in the test file, copy constructor and assignment operator are not used.

Prohibit their copy constructor and assignment operator.