Fix for NULL Entity when damage source is unknown.

HUGE UPDATE!

[Active Items]
Now items can be activated by using [+AISUseActiveItem] and if you have few, you can cycle through them with [+AISCycleActiveItem]

Added to API OnUse/OnUseClient to items as well OnUseCooldown to add cooldown.

On the botton of the screen

[Item Creator and Entities]

AIS now allows to spawn items as entities in the world thanks to Item Creator (use AIS_ItemCreator to open up a SpawnMenu!).
They are floating above the ground a little bit, bounce and can be picked up with your USE key.

[Drop Inventory]

With AIS_DropInventoryOnDeath (0/1) and AIS_DropOnlyEquipped (0/1) now you can enable dropping EQ on death! Additionally you can set that only EQUIPPED Items are dropped, not your whole inventory!

(This feature is turned off by default.)

[Improved Notifiactions]

Now they stay a little shorter, added little circle timer to show how long they will stay.

Renamed Torso to Chest
Added custom notifications
Updated Summary in Inventory Panel to show better stats when Realism Mode is enabled

added particles based on armored/nonarmored hitgroups.

Fixed Blast Damage ignoring armor

Added AIS_ShowAllItems