New lockscreen

Desktop.js

[feeds] Feeds page added.

[uninstall] Uninstall/remove areas to homescreen.

[lock] Lock the screen from anywhere in the homescreen. Also kill application by dragging it down.

[toolbar] New toolbar on the bottom

[rpm] Fix Qt5 compositor depedency.

[covers] Remove application covers from window model and do not show cov...

TODO: will need to inherit this properly from a theme (once we have
notifications mockup in place)

[glacierui] Notifications modified as per some of the specs

[glacierui] Notification previews

Proper closing button and black toolbar.