Two more ExplorerListGadget flags to filter listing

[offsides]

When file listing is enabled, the ExplorerListGadget shows all files. In some cases, the programmer may not want the user to see certain files, say hidden or system files.
Shardik showed an ingenious solution in http://www.purebasic.fr/english/viewtop ... 13&t=57664 but with a large number of files, it could be slow.

I'm suggesting the addition of two more flags, #PB_Explorer_NoHiddenFiles and #PB_Explorer_NoSystemFiles

Thanks.