Change to PeSTO's evaluation function

Hopefully a better evaluation. At least more granular, and includes
tapered evaluation for all pieces. Can/should be tuned spesifically for
Goldfish, but for now the value as presented are taken as-is.

https://www.chessprogramming.org/PeSTO%27s_Evaluation_Function

Bench: 817046 nodes 2389023 nps 342 ms

Author: bsamseth