UI Adjustments and Pack Switcher

- Also has Background adjustments (immature)

Background image loading is small and also on first attempt to switch nothing happens. Not sure why that is. OLLOTH PLS.

I also pass Modpack to the gamelauncher but it doesnt have the friendly name, so when the game launches it has "tekkitlite" as the window title. Maybe we can get the pretty name into the modpack class?