some of the behavior of the theme has changed.
this makes some of the old themes to not work correctly
(like black text on black)
read a version number of the "plasma version this theme has been intended for"
and use it to change the behavior for retrocompatibility
(all themes that don't export this are assumed to be from KDE4)
Change-Id: I4bc20a0c10de9f9a6c3facd63b6c5b6da210039a
0ca29bc0f2