[Game] Fix projectile management

[facerix]

• (I'm not keeping track of them correctly, especially the sword)
• ideally, instead of player.projectile = {}, we should have something like this: player.swordProj = {}; player.itemProjs = []; loc.InventoryItem.maxProj = 1; player.getProjsOfType() loc.InventoryItem.getProj() = { if(len(player.getProjsOfType(this.declaredClass)) < this.maxProj) { // get proj } else { return Null; } }