Implement the SP_SetText* and MultiSprite_* functions added by
StoatSpriteEngine (as well as the TRANS_* functions introduced in
SACTDX). Enough to get to the opening movie in Vanish!
Split the code from sact_graphics.c into sprite.c and hll/SACT2.c.
sprite.c contains an index-independent sprite/scene interface, whereas
hll/SACT2.c handles the indexing of sprites.
This is to better support the StoatSpriteEngine.MultiSprite_* functions,
which use a different indexing system.
Fixes an issue in Tsuma Shibori (and probably other games) where .acx
file lookup fails because the actual file name contains characters which
differ in case from the name given in the code.
xsystem4 can now be run from within a game directory with no arguments.
Alternatively, the game directory can be passed instead of the path to
System40.ini.
Nunuhara Cabbage