Display picons by service name. Credit Huevos

Add ability to dsiplay picons based on service name. See commits below

http://sourceforge.net/p/openpli/enigma2/ci/23c92040bdaf985ba36c3205af179b93fad86e38/
https://github.com/OpenViX/enigma2/commit/cc963cd25d7e1c58701f55aa4b382e525031966e