* NEW: MapItemManager: new methods to create corresponding map items.
* BUG: MapDetailGui: Picking up a part now gives the player the actual
map instead of the display item.
* BUG: ImageRendererExecutor: The worker's name is now the correct one.
* BUG: Picking up a map or putting it in the hand from an inventory now
correctly initializes the map.
* NEW: added zLib dependency.
* NEW: removed all classes moved to the zLib, and updated the references to these classes to the zLib ones.
* BUG: fixed some GUI navigation problems.
* NEW: implemented the items renaming into the details GUI.