Change sdk connection from shared to unqiue ptr
to make sure to only have one connection alive at
every time. This fixes to removal of wallpaper because
of a bug a shared connection as set in the monitorlistmodel.
The SDK connection is now part of the ScreenPlayWallpaper/Widget.
The next will be to merge SDKConnector into the ScreenPlayManager.
We now have the first version of bi directional messages. This is for updating values like
saving the current Widget position. We also save a SDKConnection shared reference inside
our ScreenPlayWallpaper or ScreenPlayWidget instance. So we now have all logic in these classes.
