Chess Tactics in Caro-Kann

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* Added notifications settings; select which notifications you want to see in the Practice
* "Go" floating button on the home screen now opens the first new exercise
* Added Instagram share for puzzles
* Added voice chooser setting for Animation
* Improved dark theme support, you can now use "Follow system" option to match your system theme
* Make statistics colors in the light theme more bright
* Copy full exercise PGN to the engine after solution
* Various fixes and improvements