The KGameRenderer API is adjusted to use a KgThemeProvider instead
of KGameTheme. To ensure that everything still compiles, games using
KGameRenderer are ported to KgTheme immediately.

Some comments about how the games were ported:

* KAtomic, Kolf, Kollision and KReversi don't install .desktop files for
  their themes anymore. They are not really needed since there is only
  one theme per game, but KGameRenderer previously required a .desktop
  file for KGameTheme. KgTheme works with hardcoded SVG paths, too.

* I found that Granatier abuses the KGameRenderer framework in a quite
  interesting way to add support for a fallback theme. The proper
  solution is to integrate this functionality in KGameRenderer. This
  commit does a very direct port to KgTheme only.

svn path=/trunk/KDE/kdegames/knetwalk/; revision=1289083