#588 Registry leftovers

[Snickie]

When uninstalling ffdshow on Windows 7 it doesn't unregister the ffdshow.ax codec. When browsing the codecs i Windows with e.g. GSpot version 2.70a it shows many "file missing" refering to ffdshow.ax.
You have to manually clean many entries in the registry.

Expected behaviour: The uninstaller should clean after it self!

Used version: ffdshow_rev3351_20100408_clsid.exe