Eliminate the wstring game name.

Some cleanup throughout related code. (try to make logic in ISOFile understandable by a human)
Encode strings in UTF-8 rather than somehow trying to determine the encoding in the GUI code.

Non-windows OSes temporarily broken.

Source/Core/DiscIO/Src/VolumeCommon.cpp

@@ -111,5 +111,13 @@ u8 GetSysMenuRegion(u16 _TitleVersion)
 	}
 }
 
-};
+std::string IVolume::GetName() const
+{
+	auto names = GetNames();
+	if (names.empty())
+		return "";
+	else
+		return names[0];
+}
 
+}