Cleaned up InputDevice.*

git-svn-id: https://www.libavg.de/svn/trunk/libavg@9602 44470bb9-56e9-0310-a0f8-c586564d3dc6
Got rid of EXTRACT_INPUTDEVICE_CLASSNAME.

git-svn-id: https://www.libavg.de/svn/trunk/libavg@9603 44470bb9-56e9-0310-a0f8-c586564d3dc6