[Update] optional packages will only be downloaded/enabled if needed
         therefore during first use of such packages an online connection may be required
         if a package is not used in 60 days it will be disabled again
		 currently the following packages are disabled by default (more to come):
		 DGIndexNV, FFmpeg, MKVMerge, NeroAACenc, QAAC, x264, x264_10b, x265
		 DGIndexNV, NeroAACenc, QAAC and x265 still need to be enabled in the MeGUI settings
		 NeroAACenc, QAAC and x265 need a restart of MeGUI so that the presets are enabled


git-svn-id: http://svn.code.sf.net/p/megui/code@2431 a21b8521-4df1-4ed3-b48c-cff5bc73dcb3