Arcanium Code

* Fixed a bug with the display of the units within a zeppelin.
* Added persistent effects for the ground below buildings.
* Improved main building sprites.
* Improved blocked areas.
* Added a Python script to copy image files to the Release directory.
* Fixed a bug with the statistics (killed units and destroyed buildings works properly now).
* Dragging the mouse does not abort commands anymore.
* Effects can be retrieved before world creation now.
* The player view can't leave the map anymore.