openbor Tools

Fix biker.

Remove fall checking in bounce section(function check_gravity), because all animations have default values, don't need to be checked.

changed the itembox code so that didhitscript runs after the engine item code so modders can have the updated variables for their scripts

npc's bounce value default to 1.

Change animation command "bounce" to "bouncefactor", because another command uses the same name.

Add ATK_ITEM.

Change STA_ATKS to 6, to match the new itembox (new attack type).

New feature: itembox

~Used just like an attack box declaration but when it hits an entity, the entity using itembox will be picked up.
~This allows for touch items that are floating in midair as well as better touch item capabilities than subtype touch.
~Probably don't put it in any entities that are not items.

Also, "weapon" for both changeentityproperty and changeplayerproperty has a new flag: put 1 after "weapon" to retain the entity's current animation after switching weapons. Currently, switching weapons in midair will make the player go idle until they hit the ground so that is why this was implemented.

Move some code from function spawn into function ent_default_init. An entity will be initialized automatically when spawn is called.

loadingbg is used for when loading models.
loadingbg2 is used for when we load the levels.