D25785: [Plasma Style KCM] Add a color-wheel sign denoting the theme supports the system color scheme

[Filip Fila]

filipf created this revision.
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REVISION SUMMARY
  The discoverability of the system color scheme awareness feature of some Plasma themes right now is very poor.
  
  In addition to that the previews for Breeze and Breeze Light look identical when using the default color scheme.
  
  To fix this we add a little color wheel icon in the top right corner of the theme preview that only shows up if the theme supports this.
  
  Credits go to @broulik for most of the code, I just positioned the icon.
  
  BUG: 364953

REPOSITORY
  R119 Plasma Desktop

BRANCH
  little-color-sign (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D25785

AFFECTED FILES
  kcms/desktoptheme/kcm.cpp
  kcms/desktoptheme/kcm.h
  kcms/desktoptheme/package/contents/ui/ThemePreview.qml

To: filipf
Cc: broulik, plasma-devel, LeGast00n, The-Feren-OS-Dev, jraleigh, fbampaloukas, GB_2, ragreen, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, ahiemstra, mart
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