World Game Update v0.0.1.11

Another update to World Game!

• Added Cow Entity.
• Added Furnace Smelting functionality (Temperature-based)
• Added Iron Ingot.
  
• Added Copper Ingot.
• Added Iron Sword. (recipe temporary; +25 attack damage)
• Added Raw Beef. (+10 health)
• Added Steak. (+40 health)
• Added Burnt Steak. (can be used as furnace fuel)
• Added Player attack sounds. (varies depending on the held item like swords vs other items)
• Added sound when picking up items from the ground.
• Added small drag when entities are free-falling to prevent infinite acceleration.
• Some of the existing items and blocks are now considered as fuel for the furnace.
• All chunks will now be rendered into 2 meshes (one for normal blocks, one for translucent) instead of 1 mesh per chunk.
• The glass block recipe now needs to be smelted instead of crafted within inventory.
• Removed NPC entity. (it's now an abstract class for the new Cow)
• Updated the default held item position.
• Copper Sword now has a temporary recipe.
• [back-end] Added Modular Inventory GUI. (it's used to open the same player inventory with different additions)
• [back-end] Added IFoodItem interface for food items.
  
• [back-end] Added IFuelItem interface for items that can be used as fuel.
• [back-end] Added overridable Destroy() and Place() in block class.
• [back-end] Added overridable BeforeBlockEntityRemoval() method within BlockEntity class.
• [back-end] Block Entities now store their positions.
• [back-end] Removed unwanted Item class constructor.

[back-end] = Features not added to the game, but is inside the game's code.

If you find any bugs, please report them. Have Fun! :)