Convert methods could return a std::string and numeric value

[dturner]

See discussion here #18 (comment)

[philburk]

This would require returning a std::string, which would have to be deleted.

[philburk]

If a user wants to print the number then they can do this:
LOG("foo() returned %s(d)", convertToText(result), result);

[dturner]

C++17 is better at declaring compile time values but only C++14 is supported in AS.