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Sometimes we might to perform some advanced operations like benchmarking on a specific position of a variant. Sending commands to engine will be useful in this case.
After this change, in Advanced Analysis page, user can send command to engine. However, they cannot send all kinds of commands. Commands like quit, flip, ucinewgame, etc. cannot be sent (see the code for details).
This PR does no change to Play against Fairy-Stockfish page. It won't be displayed on this page.