Samsung YH-920: enable inverting of colours on the lcd.

Change-Id: Iaf70e9e854a52c6ddd12bc81e59580dbc3938888
Samsung YH-920: enable lcd contrast setting, fix default lcd contrast.

Change-Id: I58303feed59754143f57889ab19a21a628d5ed3d
Samsung YH-920: properly implement and enable lcd flipping.

Change-Id: I0a8609c9b4849332a97a125d186f339a61e4d584
Samsung YH-820: implement an inverting of colours on the lcd.

Change-Id: Ibddf444b35402f8d2a9ad8b6af9d897a6618da18
Update SVG image of the Creative Zen Xfi 3.

Previously buttons was wrongly signed.

Change-Id: I10fdc126bb289f4cf5c0cbc482346356d7cc96f9