Log Message:
xfce4-calculator-plugin: update to 0.7.0

Change log:

- GTK3 Port and features from the 0.6.90 release
- Translation updates: Basque, Belarusian, Bulgarian, Catalan, Chinese (China),
  Chinese (Taiwan), Croatian, Czech, Danish, Dutch, Finnish, French, Galician,
  German, Hebrew, Hungarian, Italian, Japanese, Lithuanian, Malay, Polish,
  Portuguese, Portuguese (Brazil), Russian, Serbian, Slovak, Spanish, Swedish,
  Turkish, Ukrainian