Remove the ill-considered StringRef::numberOfCharacters

It never counted characters, only codepoints. If you think these
are interchangeable, you should not touch non-ascii text.

include/reporters/catch_reporter_console.cpp

@@ -321,8 +321,7 @@ public:
 
     friend TablePrinter& operator << (TablePrinter& tp, ColumnBreak) {
         auto colStr = tp.m_oss.str();
-        // This takes account of utf8 encodings
-        auto strSize = Catch::StringRef(colStr).numberOfCharacters();
+        const auto strSize = colStr.size();
         tp.m_oss.str("");
         tp.open();
         if (tp.m_currentColumn == static_cast<int>(tp.m_columnInfos.size() - 1)) {