Clean up code for initial solution and fix bugs
Clean up code for initial solution and fix bugs

Add comments to better describe parts of the code
Remove GameMap.display() empty method
Fix issue about backpack having array of arrays instead of just an array of items
(the problem was that splice returned an array with the item, not just the item)
Remove unnecessary code
Fix backslashes in game logo
Fix bug with PLAYER winning message's number of items

nbkhope/phase-0,nbkhope/phase-0