Add back the desktop iconview.

• Add configuration option
• Create GUI component
• Implement into Desktop
• Set up DnD
• VFS Integration
• Add configuration option to https://github.com/os-js/osjs-settings-application
• Figure out DnD bug in File Manager app (possibly GUI component)
• Shortcut support (including virtual paths)
• Root contextmenu
• Gost droppable (see Grid based desktop icon view #74)
• Add support for moving instead of copy from contextmenu
• Add back color invertion from v2 (where backgrounud color would set the mask of selected entry)
• Enable desktop iconview by default
• Add VFS watch event trigger (client only at this moment due to no default enable in server)
• Grid support

Ref:

• Desktop iconview shortcuts and general improvements #73
• Grid based desktop icon view #74