D16076: load icons from proper icon themes

[Marco Martin]

mart created this revision.
mart added a reviewer: Kirigami.
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REVISION SUMMARY
  this renders Kirigami.Icon and internal QQC2 icon loading mechanism
  compatible, as creating a valid theme, QIconLoader will work.
  
  always install index.theme
  
  Revert "always install index.theme"
  
  This reverts commit ec559a907fe15fea9d52bd051ca82ef8c62ca000.

TEST PLAN
  on android the gallery loads both icons in Kirigami.Icon and in
  QQC2 ToolButtons

REPOSITORY
  R169 Kirigami

BRANCH
  phab/iconthemes

REVISION DETAIL
  https://phabricator.kde.org/D16076

AFFECTED FILES
  KF5Kirigami2Macros.cmake
  src/desktopicon.cpp
  src/desktopicon.h
  src/kirigamiplugin.cpp

To: mart, #kirigami
Cc: plasma-devel, dkardarakos, apol, davidedmundson, mart, hein
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