更新日志：
- Decoding to WAV format implemented
- Multiple files conversion implemented
- Player for original/converted files in batch list implemented
- Batch list is now can be sorted
- Template based output path generation implemented
- Major interface improvements: toolbar, main menu, status bar are added
- Fixed bug which was cause of random software crushes when converting to mp3 format
- Bug when all output file names were created in lower case is fixed
- Fixed some spelling in UI texts
- Problem when some of M4P tags were not transferred to output file is fixed