Removed icons from this repository.  They're in buildroot/art/ now.

Signed-off-by: The Doctor <drwho@virtadpt.net>
Deleted lxde stuff because it's not used anymore.

Signed-off-by: The Doctor <drwho@virtadpt.net>
Migrated the backdrop for v0.4b to buildtree/art/.

Signed-off-by: The Doctor <drwho@virtadpt.net>