Add EnableFlagSorting similar to EnableCommandSorting

[swills]

It seems to me based on my usage that it would be nice to have a variable called EnableFlagSorting, similar to the already existing EnableCommandSorting. This would avoid having to set Flags().SortFlags = false, PersistentFlags().SortFlags = false and InheritedFlags().SortFlags = false in so many places.