Smoke Rack GUI Interface.

1. Created a new GUI interface for the smoke rack, this allows the play to open the smoke rack GUI and look at the items hanging to determine if they are dried or smoked without having to remove them from the smoke rack.
2. Items can be added and removed from the smoke rack GUI and will consume one Wool Yarn when they add an item. 
3. Items can be still be added to the smoke rack without using the GUI, by selected the item and clicking the smoke rack. This method still consumes one Wool Yarn for each item added.
4. Items can be still be removed from the smoke rack without using the GUI, by sneaking and clicking on the item to remove. The player must have an empty hand to do this.
5. When clicking on the smoke rack and opening the GUI, if the player does not have Wool Yarn in their inventory an error message is shown to tell them.
6. After adding an item in the smoke rack GUI, if they run out of Wool Yarn, the error message is shown they have no Wool Yarn.
7. If they try to add an item without using the GUI and they have no Wool Yarn, the GUI will open instead of adding the item, and the error message it shown.
8. Added an option to change the smoke rack material from Wool Yarn to Jute Fibre.