Rewrite core Dialog implementation in VueJS

(from redmine: issue id 2312, created on 2016-04-07 by benjamin.fischer, closed on 2016-04-08)

• Relations:
  • duplicates #2236
  • precedes #2313
  • child #2216
  • parent #2297
• Changesets:
  • Revision 2683 by Benjamin Fischer on 2016-04-08T12:31:11Z:

Dialog: rebuilt using VueJS, fully documented. fixes #2312

• Revision 2683 by Benjamin Fischer on 2016-04-08T12:31:11Z:

Dialog: rebuilt using VueJS, fully documented. fixes #2312