libgba stable release

libgba 20060209 is now available. This release addresses some minor issues with register defines and inline functions. We have also added a global gba.h by popular request.

The full list of changes.

added type to FadeToBlack inline
added global gba.h header
doxygen corrections
corrected MULTIBOOT_MODES enum
corrected REG_SOUNDCNT_L
add void type to inline functions
added direct sound defines
added SPRITE_SIZECODE enum
correct REG_BG3PC
Changed type for Setmode
improved interrupt dispatcher
Fixed sign issue for __udivsi3 override
allow multiple interrupts to be enabled and disabled simultaneously