Added basic UI; moved some more stuff to load pre-run;
I've moved the init() content to the constructor and made the skins load before running to allow the Eclipse WindowBuilder to show up MinecraftSL properly. Before moving init() it showed nothing. Moving the stuff in Skin fixed an nullpointer and made the logo (big corrupt grass block) visible in the WindowBuilder. And yes, the UI was made in WindowBuilder. Tweaks are needed to make it 100% functional.