Added KeyEvent docs, more reference improvements.

git-svn-id: https://www.libavg.de/svn/trunk/libavg@9265 44470bb9-56e9-0310-a0f8-c586564d3dc6
More reference improvements.

git-svn-id: https://www.libavg.de/svn/trunk/libavg@9266 44470bb9-56e9-0310-a0f8-c586564d3dc6