Object and Item Injectors added

[jonasesser]

Needed for object/item modifications, saving dropped items in db and for modification of ground items via WheelMenu.

[github-actions[bot]]

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[jonasesser]

Code for Update a GroundItem:

    static updateItem(item: GroundItem) {
        InventoryView.update(item.item);
        ServerItemController.update(item);
        ServerObjectController.update({ uid: item.uid });
    }

would of course be nicer if we could manage it soon with one line of code