D10019: Port minimize all applet from it's own plugin to org.kde.TaskManager

[David Edmundson]

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REVISION SUMMARY
  This reduces the code we have and implicitly fixes it under wayland.
  
  Tracking of which windows are minimised by us is now done in JS, and
  through use of model indexes instead of X window IDs, which wouldn't
  really have worked under wayland.
  
  Potentially we may have some minor behavioural differences on X with
  regards to which windows are managed, as the old code did not skip those
  with skip_taskmanager.
  
  Requires a tiny patch in libtaskmanager to export persistentmodelindexes to
  QML.

TEST PLAN
  Under wayland:
  Had 3 windows, one minimised already
  Clicked button. All minimised.
  Clicked again, two restored

REPOSITORY
  R114 Plasma Addons

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D10019

AFFECTED FILES
  applets/minimizeall/package/contents/ui/main.qml
  applets/minimizeall/plugin/minimizeall.cpp
  applets/minimizeall/plugin/minimizeall.h
  applets/minimizeall/plugin/minimizeallplugin.cpp
  applets/minimizeall/plugin/minimizeallplugin.h
  applets/minimizeall/plugin/qmldir

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