Modan v0.1.6 released

From version 0.1.6, Modan can handle (import/export) Morphologika2 file format, including wireframe, polygon, and category information. Improved user interface now supports multi-object drag-n-drop, better import and export dialog, and prettier toolbar. Under the hood, a lot of messed-up source codes and files are being cleaned up. I think Modan is becoming a 'usable' program, more or less. Still, way to go.