[OM2009] Paroli background

[Joel Newkirk]

Instead of recompiling paroli-launcher.edj to change backgrounds,
it would be nicer and more flexible if paroli and all its components
used a separate edje file (like paroli-back.edj for example) for
background. This permits all components to utilize the custom
background instead of just the launcher, and makes it simpler to
support a variety of background types, like scaled vs tiled, and
even animated. (I toyed with the idea of having multiple background
images, and cycling between them every few minutes)  Then add
'background' to Paroli settings->display to permit selecting among .edj
files stowed in /usr/share/paroli/applications/background/, perhaps.

j