Added functionality

- Added more functionality to the game.
- Added the new description stream, that gets updated every time a new
item is bought for the first time.
- Rationalized the way the items are populated in the shop
- Rationalized the way the item attributes are updated when new items
are bought (no longer loading the whole shoplist again)
- Commented the code to make it faster to go through it
- Added item description property to the items with some lorem ipsum