* Add basic EquipmentSlot struct
* Add Load function to EquipmentSlot
* Move EquipmentSlot struct to inventory_grid.go
* Add equipmentSlots arg to ItemGrid struct
* Add basic rendering of equipment slots.
* Change rendering of equipment slots to simply use their static x and y
* Add ChangeEquippedSlot function
* Add initialization to all equipped slots types.
* Fix Y locations of equipment slots
* Move default equipment slots to a genEquipmentSlotsMap function.
* Change Item to item
* Fix coordinates
* Change usage of string to EquippedSlotType when dealing with different slots in rendering.
* Fix import error
* Remove neck example
* Add loading sprites of equipped items.
* Clean code in Inventory rendering
* Clean code in Inventory rendering
* Clean code in Inventory rendering
* Change default items that get rendered.
* Change default items that get rendered.
* Add width and height to EquipementSlot struct
* Fill in width and height to current equipment slots.
* Fix Y setting of equipment slots
* Rename variables for clean code.
* Change handling nil itemSprite to condition instead of loop return.
* Split Render function to 2 functions.
* Add TODO
* Change comment to start with capital I
