more various tweaks to held items and chests in order to make carrying chests fun

scripts/JumpPlatform.gd

@@ -25,6 +25,9 @@ func _on_area_3d_body_entered(body):
 	if body.is_in_group("player"):
 		can_jump = true
 		player = body
+	if body.is_class("Chest"):
+		body.velocity.y = jump_amount
+		jump_sound.play()
 
 func _on_area_3d_body_exited(body: Node3D) -> void:
 	if body.is_in_group("player"):