xbak 0.1.3 released

Version 0.1.3 of xBaK, a fan-made remake of the computer RPG classic "Betrayal at Krondor", is released. This release features improvements to the inventory dialog. Dragging and dropping inventory items now actually works. A utility is added to convert some of the data files into more standard formats.

Full change log:
* Basic inventory handling now works.
* Rewrote dragging and dropping widgets using events.
* Implemented saving image resources (BMX, SCX files).
* Added compression methods.
* Added a tool for extraction and archiving of resources.
* Started adding a little code documentation (Doxygen format).
* Several bug fixes.