Radlight Filter Manager 1.6

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* Rewritten several parts by using faster and more flexible data containers (derived from TList)
* Empty categories are not shown anymore
* Added handling of environment variables in paths (Movie Maker filters under Vista)
* Added handling of filenames without path (ksproxy.ax under XP/Vista, quartz.dll under Vista)
* Essential filter files (those without path and additionally quartz.dll under XP) cannot be unregistered anymore.
* Displays a message box if admin rights are missing (e.g. for registering)
* Added Refresh, Navigate and Save Category as Text File commands to popup menu
* Added right-click selection of tree nodes
* Added hints for some buttons
* Added file version as filter subnodes and in category text files
* Larger default width/height
* Faster memory management with FastMM4
* Removed BlackList Tab (we've enjoyed this joke long enough...)