openbor Tools

For some reason models.txt didn't skip commented lines (#....).
Fixed.

Fix CMD_MODELSTXT_MAXIDLES, should be 1 instead of 0.

Fix a hall of fame crash bug when a player model is unloaded (e.g., AOF BORR).
Fix a select screen crash bug when a player model is unloaded (e.g., AOF BORR).
Add a temporary solution that NULLs the model handle in model_cache before deleteModel is called.
TODO: merge model cache logic (model_cache and modellist should be checked at the same time).
Other minor fixes:
Change most of the bit field type to int in openbor.h, otherwise the compiler tends to complain when they are used as array subscripts without a cast.
Clear player keys after a scene (otherwise there's no way to skip a scene before a select txt without triggering a confirm button).

Removed force mprate check when magic_type = 1.
Change error message of script function loadmodel to fit the new logic.

Update uncache sprite functions.
How it allows unloading only the sprites and keeping the model.

Unload flag 2 for model, delete sprites as well.
TODO: take care of those subclassed models.

Expand s_sprite structure and chagne other sprite related stuff for later use.
Now s_sprite stores original width and height as well as offsets to avoid loading and cropping the same image file multiple times.

Change TYPE_RESERVED to 0x40000000 to avoid script variable unsigned to signed problem.

Print different error message for changing candamage/hostile/projectilehit properties.

Fix a mistake in last update, in check_attack_chance, it should have a higher chance to skip the attack when off-screen, not lower.