D18700: [Color Picker] Allow dragging color button to drag color

[Kai Uwe Broulik]

broulik created this revision.
broulik added a reviewer: Plasma.
Herald added a project: Plasma.
Herald added a subscriber: plasma-devel.
broulik requested review of this revision.

REVISION SUMMARY
  One can already drag colors from the popup grid to applications but this wasn't possible with the recentmost color shown in the compact representation.

TEST PLAN
  Picked a color, dragged the tiny circle in my panel to Kolourpaint's palette, got the color dropped there.
  Dropping a color *onto* the button to add it to the history still works
  
  Only minor issue is since the `MouseArea` steals the press from the button, there's no press feedback on the button, only hover.

REPOSITORY
  R114 Plasma Addons

REVISION DETAIL
  https://phabricator.kde.org/D18700

AFFECTED FILES
  applets/colorpicker/package/contents/ui/main.qml

To: broulik, #plasma
Cc: plasma-devel, jraleigh, GB_2, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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