[Merge] lp:~khurshid-alam/unity-control-center/sharing-panel into lp:unity-control-center/18.04

[Khurshid Alam]

Khurshid Alam has proposed merging lp:~khurshid-alam/unity-control-center/sharing-panel into lp:unity-control-center/18.04.

Commit message:
Import sharing panel from gnome-control-center

This commit imports sharing panel from gnome-control-center and removes old screen-sharing panel.
https://bugzilla.gnome.org/show_bug.cgi?id=731862

Requested reviews:
  Khurshid Alam (khurshid-alam)

For more details, see:
https://code.launchpad.net/~khurshid-alam/unity-control-center/sharing-panel/+merge/370768
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