Stacked dummy player for nested tooltips especially for items

[LordMidas]

For nested tooltips of items and skills of items we have to equip the item on a dummy player on the backend. Currently this is only supported for a single instance of dummy player and the implementation is very finnicky.

The ideal solution would be to have layers of stacked dummy player instances for each nested tooltip and the relevant item is equipped on the given dummy player. Then when no longer required, the dummy player is destroyed.

[LordMidas]

Some progress has been made in this regard as of 6662939