card customization & dragndrop features

[jmtemmos]

Thanks for this great plugin. it would be great to add the following features :

• customization of what fields could be displayed within the issue card : tags (from additional_tags), custom fields (like lists with checkbox), observators,...
• allow dragndrop between different versions lines (when grouped by version) to trigger version change
• allow dragndrop change between different categories lines (when grouped by categories)
• more inline fields modification (like the done_ration) for elements displayed within the card view : custom fields, etc...

Just some ideas....

Thanks a lot for your work