Bread Engine 1.5.5

This is a bugfix release of Bread, that should no longer crash during engames. This version is also stronger than version 1.5.0 by around 40 elo, though i haven't ran a progression test.

Additions/Improvements:

• better debugging features
• added static exchange evaluation pruning to the main search
• added the improving heuristic

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Bug fixes:

• fixed storing invalid evaluations in the transposition table when the only legal move is excluded
• fixed singular beta going out of the legal evaluation range
• fixed a search stack overflow