Backpack: Such improve. Very cleanup. Many fix. Wow:
* Fixed a crash on dropping an equipped tool while dragging it
* Improved visibility of search reset
* Made draggable slots fully opaque, darkened slot backgrounds
* Made undraggable slots faded, regardless of open/close state
* Changed dragging background highlight to white outline so you can see it even if the tool is equipped
* Fixed bug where you could drag empty slots
* Added a bit of buffer to tool name border
* Fixed a crash on more than 10 hotbar slots
* Optimized calls to hotbar slot adjusting
* Removed all the prints everywhere
* Cleaned up slot class
* General cleanup