C++: Use Token::utf16chars{Begin,End} where appropriate

...especially in CppTools/CppEditor where the offsets are used with a
QString/QTextDocument.

Change-Id: Ic6d18fbc01fb9cc899a9bd2d7424cd2edae487f1
Reviewed-by: Erik Verbruggen <erik.verbruggen@digia.com>

src/plugins/cpptools/doxygengenerator.cpp

@@ -83,7 +83,7 @@ QString DoxygenGenerator::generate(QTextCursor cursor)
         foreach (const Token &tk, tks) {
             if (tk.is(T_SEMICOLON) || tk.is(T_LBRACE)) {
                 // No need to continue beyond this, we might already have something meaningful.
-                cursor.setPosition(block.position() + tk.bytesEnd(), QTextCursor::KeepAnchor);
+                cursor.setPosition(block.position() + tk.utf16charsEnd(), QTextCursor::KeepAnchor);
                 break;
             }
         }