logic: used wstring in FilePath constructor

* used wstring in FilePath constructor where easily possible
* added FilePath concatenate method that accepts string parameter
* implemented using only wstring in MessageStatus
* used wstring in config

src/lib/utility/text/TextAccess.cpp

@@ -134,7 +134,7 @@ std::vector<std::string> TextAccess::splitStringByLines(const std::string& text)
 }
 
 TextAccess::TextAccess()
-	: m_filePath("")
+	: m_filePath(L"")
 {
 }