New operands for `test_diagnosis_t` defined operations

New Features

• Support new type/kind operands with the test_diagnosis_t operator .equalsExpected.

  • integer(c_size_t)
  • type(c_ptr)

• Support integer(c_size_t) arguments in string_t constructor

• Support user-concatenation of string_t and character values to test diagnoses via operator(//)

  refac(string_test):simplify via defined operations

Pull Request Log

• Add test_diagnosis_t operators by @rouson in #98

Full Changelog: 3.0.0...3.1.0