ITEM.CanPickup controls use behaviour

[VortixDev]

The ITEM.CanPickup function also determines whether or not an entity can be used (whilst the item is spawned as an entity, i.e. not in the player's inventory). The function should either have its name updated to correctly represent what it does, or, ideally, its control behaviour should be split up into ITEM.CanPickup and ITEM.CanQuickUse (or similar) functions.

[VortixDev]

I am closing this issue as "Pickup" determination is consistent throughout the function: picking ups due to usage are also considered by this function, and the quickUse parameter is provided to allow developers to distinguish between the cases.