ui: use wstring in gui relates places

* loading icons
* loading fonts
* context menu action for copy path to clipboard
* context menu action for open containing folder

src/lib_gui/platform_includes/includesWindows.h

@@ -35,7 +35,8 @@ void setupApp(int argc, char *argv[])
 		{
 			appPath = appPath.substr(0, pos + 1);
 		}
-		AppPath::setAppPath(FilePath(appPath));
+		AppPath::setAppPath(FilePath(L"C:/sourcetrail/täst/Sourcetrail_2018_1_19_32bit")); 
+		//AppPath::setAppPath(FilePath(appPath)); C:\sourcetrail\täst\Sourcetrail_2018_1_19_32bit
 	}
 
 	{