Add help messages for xboxdrv and killswitch
Fix #92: First right-click fails in List view
Confine the double click simulator to Grid view (fix #88)
Fix fat blank space added when switching view

"The add_with_viewport() method is used to add a widget without native
scrolling capabilities to the scrolled window. [...] This will be
wrong for most widgets that support native scrolling."

The TreeView and IconView both having native scrolling capability,
there came the glitch.
Refresh downloaded icons in Grid view (fix #87)
Rename iter_xrandr_output to get_vidmodes
ScummVM 1.7.0 config
Use tarballs attribute for ScummVM