C -> C++

- Integrated wcwidth6.c more into text.cpp.
- Moved wcwidth6.c to wcwidth6.cpp, to cure some strange build issue.

src/text.h

@@ -91,5 +91,7 @@ std::string rightJustifyZero (const int, const int);
 std::string rightJustify (const int, const int);
 std::string rightJustify (const std::string&, const int);
 
+int mk_wcwidth (wchar_t);
+
 #endif
 ////////////////////////////////////////////////////////////////////////////////