Resize Cover v1.2.0

All kiwidude plugins updated/migrated to: https://github.com/kiwidude68/calibre_plugins

Added

• Add Help button to menu and configuration dialog.
• Dutch translation (W.P.M.E. Hofland)
• Italian translation (Ettore Mazzitelli)
• Japanese translation (Pk11)
• Portuguese translation (Comfy.n)
• Russian translation (ashed, Caarmi)
• Spanish translation (@dunhill)
• Ukranian translation (@yurchor)

Changed

• Breaking: Drop PyQt4 support, require calibre 2.x or later.
• Refactoring of common code

Fixed

• Deleting menu rows could have wrong selected items. (@CAPink)