* NEW: Added proper license headers.
* NEW: New image loading management.
* NEW: Added a threaded worker to run the image loading/saving.
* OPT: Moved images to the images/ subdirectory.
* NEW: Added the commands and image packages.
* NEW: ImageMap is now an abstract class rather than an interface,
allowing to add several useful common methods.
* NEW: The MapType enumeration is now part of the ImageMap class.
* NEW: Added some utility methods to the MapType enumeration.
* NEW: imageName, ownerName and worldName are now common map properties.
* NEW: The PosterImage class (was previously Poster) is now used to hold
the sub-images in the PosterMap class, instead of holding an array of
SingleMaps.
* NEW: Completely rewrote the image splitting algorithm.
* NEW: Removed the MapData and PosterData classes. They were uselessly
wrapped by the PosterMap and SingleMap classes.
* BUG: Fixed some method's accessibility.
* OPT: Cleaned up the map renderer a bit.
* NEW: Added the PluginLogger class to standardize console logging.
* NEW: URLs are parsed before starting any downloading task, and an error
is shown to the user if the parsing failed.
* BUG: Exceptions are now catched at the highest possible level, so that
appropriate error messages/logs can be generated.
* OPT: Standardized code formatting a bit.
* BUG: Fix image scaling and writing.
* BUG: Using HTTPS should not prevent downloading a map.
* BUG: Exceptions during download are now correctly handled.
* BUG: Fix the "download success" message.
* OPT: Cleaned some old commented code.
