Version 0.3:
  * Some bugs fixed
  * Support for Beyond Zero Tolerance added. Still experimental,
    please report any encountered bugs

Version 0.2:
  * Some bugs fixed
  * Cell descriptions implemented: you can now change the cell type
    by right-clicking it and choosing the new value in a popup menu.
    When you select a cell, its description is displayed to the right
    of the map.
  * Added enemy/weapon/item/sprite counters
  * Clear tool: instantly clears the map
  * Fill tool: fills the map with specified value
  * Replace tool: replaces certain cells

Version 0.1:
* Initial release