Allow TouchVisualization subclasses to override the used bitmap.
Allow TouchVisualization subclasses to override the used bitmap.

svn path=/trunk/libavg/; revision=9152

scotty007/libavg,libavg/libavg,yyd01245/libavg,th3infinity/libavg,scotty007/libavg,scotty007/libavg,scotty007/libavg,th3infinity/libavg,hoodie/libavg,yyd01245/libavg,hoodie/libavg,libavg/libavg,yyd01245/libavg,libavg/libavg,yyd01245/libavg,hoodie/libavg,th3infinity/libavg,th3infinity/libavg,libavg/libavg,hoodie/libavg