Crear/merge kb cleanup

Hi all, please review and pull for:

  - General cleanup ( #30 )
  - Initial draft of delete functionality ( #37 #36 ). Needs more eye candy.
  - Total time of lists update automagically. ( #38 )
  - Search in UniverseView now works ( #45 )
  - Search is case insensitive in all views ( #48 )
  - Broken drag n' drop behaviour when the list is empty.

This depends on https://github.com/inaes-tic/mbc-playout/pull/51


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