Ratsu 1.2.0 - new chess engines

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Ratsu - UCI chess engines
Author: Eetu Rantala

Ratsu 1.2.0 what's new?

This release adds aspiration windows and futility pruning to search; and introduces updated evaluation that now uses incremental updates, bitboards, and piece-square tables for different game phases.

Games against Stash 15.3, Blunder 6.1.0, and Rusty Rival 1.0.23, suggest that this version of Ratsu would be around 2250 Elo in CCRL blitz pool.

What's Changed
Add aspiration windows by @ranzuh in #11
Add more stats to search by @ranzuh in #13
Improve tuner by @ranzuh in #12
Update README.md by @ranzuh in #14
Add futility pruning by @ranzuh in #15
Use bitboards for evaluation features and incremential updates to material + PSTs by @ranzuh in #16
Update tuner to use the new eval by @ranzuh in #17
Add Tapered eval and re-tune weights by @ranzuh in #18




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