* Restored loading bar speed/smoothness to what SX, DC, and I agreed on.
* Fixed display of default loading screen ("Loading..." text centered on black background with no progress bar)
* Make sure the engine does not try to draw a loading bar and refresh the screen if sizex <= 0
* Removed "loadingbg 2" (background only) as a separate option, instead the loading bar is disabled by setting sizex to 0
