Inventory - Added Drag&Drop and a bug fix — Ani Idle Steam update #1064117

When I first programmed the inventory system I was not able to create a drag&drop option. But today I had another idea after I received feedback on this specifically. You will now be able to drag & drop via mouse leftclick and sort your items in your inventory as you like. (Locked items cannot be dragged and equipped items neither) It is a bit clunky on the coding side, because my inventory system was not build for it, but it works. And I also found a bug, which made it possible to use one potion unlimited times. Fixed it, sorry! :D