v0.4.0

• Theming
  • Implemented configuration of colors for main GUI parts.
  • The color of all entities can be also configured.
  • Also some minor changes to the overall design were made
    to match the overall material design.
• Added group settings for relations.
• Added vo extSources settings.
• Implemented deletion of resources.
• The list attribute values can now be moved by drag-and-drop.
• Various bug fixes and improvements.