changed things to include plog

include/plog/Converters/UTF8Converter.h

@@ -0,0 +1,28 @@
+#pragma once
+#include <plog/Util.h>
+
+namespace plog
+{
+    class UTF8Converter
+    {
+    public:
+        static std::string header(const util::nstring& str)
+        {
+            const char kBOM[] = "\xEF\xBB\xBF";
+
+            return std::string(kBOM) + convert(str);
+        }
+
+#if PLOG_CHAR_IS_UTF8
+        static const std::string& convert(const util::nstring& str)
+        {
+            return str;
+        }
+#else
+        static std::string convert(const util::nstring& str)
+        {
+            return util::toNarrow(str, codePage::kUTF8);
+        }
+#endif
+    };
+}