D12040: [WIP] Add wallpaperplugin.knsrc + QML function to open GHNS dialog

[Chris Holland]

Zren created this revision.
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REVISION SUMMARY
  Patch 1/2 (other patch is for plasma-desktop)
  
  BUG: #386621
  
  - https://bugs.kde.org/show_bug.cgi?id=386621
  - To find the `Categories=Plasma Wallpaper Plugin` in the `wallpaperplugin.knsrc`, I had to find the `<name>Plasma Wallpaper Plugin</name>` on the this API url: https://api.kde-look.org/ocs/v1/content/categories
  - To find that url, I looked at: https://github.com/KDE/ocs-webserver/blob/master/application/modules/default/Bootstrap.php#L1014
  
  Screenshot of the dialog:
  
  F5800268: 2018-04-08___02-02-49.png <https://phabricator.kde.org/F5800268>
  
  This screenshot is more releavant to Patch 2 for plasma-desktop:
  
  F5800267: 2018-04-08___02-19-12.png <https://phabricator.kde.org/F5800267>
  
  TODO:
  -----
  
  [ ] Move C++ plugin to `components/shellprivate/wallpaperplugin` ? I probably need to move the new GHNS code to `components/shellprivate/wallpaperplugin` since "desktoppackage" has the widgetexplorer C++ plugins there. I figured I'd put up a working patch first.
  [ ] Update `wallpaperComboBox` and `configDialog.wallpaperConfigModel` so we don't have to close and reopen the "Configure Desktop" window for the plugin to show up in the dropdown.

TEST PLAN
  1. Install both patches
  2. Configure Desktop > Get Wallpaper Plugins > Install something (eg: Ken Burns Effect)
  3. Confirm it showed up in `~/.local/share/plasma/wallpapers/`
  4. Close GHNS dialog and Configure Desktop dialog
  5. Reopen Configure Desktop
  6. Confirm "Ken Burns Effect" shows up

REPOSITORY
  R120 Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D12040

AFFECTED FILES
  wallpapers/image/CMakeLists.txt
  wallpapers/image/image.cpp
  wallpapers/image/image.h
  wallpapers/image/wallpaperplugin.knsrc

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