oxygen-icons & plasma-workspace-wallpapers moved to git

[Harald Sitter]

As requested by the VDG all artworky bits moved out of svn and into
git because git is awesome and all that...

# oxygen-icons
moved from kdesupport svn to git. Newly available at kde:oxygen-icons.

Also going to be in plasma release scope for 5.5 as the VDG wants to
continue maintaining the theme. Until 5.5 branching this repository
only has a master branch and only unstable i18n.

# plasma-workspace-wallpapers
moved from KDE svn to git. Newly available at kde:plasma-workspace-wallpapers.

This repository is the base of 5.4.x plasma-workspace-wallpapers
releases (completely replacing the SVN version) and has both unstable
and stable i18n.

Moving forward you may want to shallow clone this repo as to avoid
cloning history cruft.

HS