feat: implement BaseHitscanWeapon class with raycasting, ammo management, and penetration support

weapons/base_hitscan_weapon.gd

@@ -147,7 +147,12 @@ func _shoot_hitscan() -> void:
 			result.collider.take_damage(damage, result.position, player)
 			
 		# Add this hit to exclude so next loop goes through it
-		query.exclude.append(result.rid)
+		var exc = query.exclude
+		exc.append(result.rid)
+		
+		# If the collider has multiple shapes, we should really exclude the whole collision object
+		# but RID of the body should be enough.
+		query.exclude = exc
 		
 		hits_remaining -= 1
 		current_damage_mult *= penetration_damage_penalty