added new last.fm svg. looks *much* better than before... basically gutted all the previous last.fm code in order to use the new svg.

beginning of layouting code, but i need to resolve a few issues with subclassing/reimplementing Plasma:: classes.

there is (again) a crash on exit, i removed the call to clear() from ~App, because it was broken (ContextScene::appletDestroyed is broken, i need to do more investigation)