extended taskboard (add/copy card, removed card-burndown, grey-color-card, show hours-sum, move/copy row)

- taskboard-card: added '+'-icon to add-card / copy card
- taskboard-card: changed order of action-icons to: change-color, add/copy-card, delete-card
- taskboard-card: removed card-burndown by commenting out
- taskboard-card: added light-grey color in card-color-picker
- taskboard-card: moved opening-big-card down from top 50px -> 150px

- taskboard-column: show hours-sum of cards per column in title as "(S23)"

- taskboard-row: show hours-sum and cumulated hours-sum of cards per row "(S23)" and "(C47)"
- taskboard-row: added "(row-position:row-id)" opening actions-dialog to
  - move row to specified new position
  - copy all cards from other row specified by row-id into current row

- fix bug in JuggernautSyncController:
  - call sync_row_action() in sync_clean_row() instead of calling sync_column_action()
  - added logging of row-id on syncing row-action