D5411: restore the "current" color scheme concept

[Marco Martin]

mart created this revision.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  add again a fake entry called current like there used to be,
  add an "Apply" button in the color scheme editor (when not in
  standalone app mode) hitting apply will apply whatever custom
  set without saving it, will be accessible trough the "current"
  entry.

TEST PLAN
  changed a single color in the set, gets correctly applied

REPOSITORY
  R119 Plasma Desktop

BRANCH
  phab/currentscheme

REVISION DETAIL
  https://phabricator.kde.org/D5411

AFFECTED FILES
  kcms/colors/CMakeLists.txt
  kcms/colors/colorscm.cpp
  kcms/colors/colorscm.h
  kcms/colors/scmeditordialog.cpp
  kcms/colors/scmeditordialog.h
  kcms/colors/scmeditordialog.ui

To: mart, #plasma
Cc: plasma-devel, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol
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