Fourth release

HBL-Emergency now has (somewhat) user-friendly message errors. If the boot_config.ini file has errors or the .3dsx file selected by the user is not found, the error will be printed on screen. This should be way better than simple a black/red screen doing nothing.

This add quite a lot to the final binary (~100KB, to a total binary size of ~220KB), thanks to the 3DS GFX code. However, since I only initialize graphics support if it is necessary (so basically, in case of errors), this shouldn't make the boot much slower.

General bug fixes and some code was rewritten, too.