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Chess engine: Topple 0.8.1

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Topple - UCI chess engine. 
Author- Vincent Tang, Rating JCER=2919

v. 0.8.1:
General
Lots of code cleanup and refactoring to improve maintainability
New material hashing scheme
Replaced custom Syzygy probing code with the Fathom library
New binaries compiled with LLVM/Clang (much smaller now).
Search
Optimised move generation of pawns
Adjusted hash table replacement criteria to favour PV nodes
Strength gains should be in the 5-10 elo range based on self play testing.

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