WIP: Preset for plot colors

Features

• Add preset dialog for series
  • Choose Preset button to load a preset. Try to use annotation to find corresponding color. If no matching found, use order.
  • Save As button that allow to choose the new name
  • Save button to override current preset
• Supports line reorder by drag'n'drop

Internal modifications

• Refactor with pqColorAnnotationsPropertyWidget
• Refactor table model

out Limitations

• Does not supports column sort
  • sort is done on the view by a QSortFilterProxyModel, but drag'n'drop works directly on model. Needs a refactor to have both working (d'n'd should probably modify only the view)

TODO

• use current preset when adding new row (instead of default one)
• allow to sort column (variable name and legend)
• rename Annotations in 'SavePresetDialog' (legend name ore something else)
• preset color name (save or save as)