Add `.gitattributes`

Update the project to Godot 4.5

[ProtoTree] Out-or-order inheritance parsing

[Issue_284] Fix drag and drop area detection

[CtrlItemSlot] Fixed `mouse_filter` not initialized properly

[CtrlInventoryGrid] Fixed `item_dropped` not being emitted

Bumping the version number to 3.0.1

[ItemSlot] Modified the `cleared` signal to indicate which item was cleared

[Inventory] Added `create_item`

Porting to Godot 4.4

[CtrlItemSlot] Fixed an error when dragging an empty item slot

[Inventory] Fixed a deserialization bug

[InventoryEditor] Clear inventory button; Multi item select

[Prototype] Optimizations

Re-enable undo/redo support