#986 5 button mouse support

[Joel May]

I have a 5 button mouse and use the back (and sometimes forward) buttons all the time around Windows. It would be really nice if 7-Zip File Manager would at least go up a folder when I push the back button.

[Dario Perovich]

Just wanted to add my voice, this would be really nice. I keep finding myself hitting my back button. Thanks for the great program!