[WIP][CR] Advanced Inventory move all items

This PR is a work in progress as part of a basic "move everything"-function between panes in the advanced inventory. The idea is that you should be able to quickly move large quantities of items instead of holding down 'm' to move item per item.

As of commit 44553ea, I'm struggling to remove items from the vehicle parts. If I try to move an item from a vehicle to the ground, it is duplicated. Also, some items seem to be moved on to the ground just below the vehicle.. I don't get pointers well enough :P So, any help is appreciated.