v0.19.0

• 🔍 Tune LMR reduction (#452)
• 🔍 PVS-LMR logic improvement (#456)
• 🔍 Implement TT in quiescence search (#308)
• 🔍 Don't clear TT move if no best move is provided: keep old one (#462)
• ⌛ Check _searchCancellationTokenSource in qsearch as well (#454)
• 🐛 Avoid storing the same move duplicated in both killer moves (#458)
• 🐛 Ensure no search depth 0 happens after a 'ponder hit' (#465)

Non-strength winning chnages:

• 🐛 Fix ucinewgame command when followed by go command (#455)

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Full Changelog: v0.18.0...v0.19.0