Fix #752 (deadlock by Fox SGF) #757
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ref. #752 (comment)
Summary:
Fox SGF has many nodes (AI's principal variation for every move). When Lizzie reads it, more than 5000 GTP commands are sent to the engine successively. Then the pipe is stalled and Lizzie falls into a deadlock. For avoiding the deadlock, this PR introduces a writer thread so that the UI thread is not blocked even when the pipe is stalled.
Thanks to lightvector for his helpful review.