Матовые шахматные комбинации

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* Added sounds for puzzles (can be disabled in settings)
* Added "Figurine" notation theme
* Added more piece sets
* Added "Invert board" option
* Added option to disable showing of the goal and evaluation
* Added ability to edit users' list
* Added Italian
* Improved notation design
* Improved contents mode
* Improved themes switching mechanism
* Small fixes and improvements