Version 0.5.6

Attempt to support .pmx exported from Koikatsu KKBP plugin. Please report issues in case of error. Improved model validation process before porting. Removed confusing debug output, the debug output will now include the error traceback. Fixed an issue where the preview does not load in some situation. Fixed the model name not being update when the user selects a new folder. and 9 other bug fixes and enhancements...