NNUE namer

So you've trained a NNUE and want to name it. Well, you've come to the right place.

Usage: ./fast_cpu_nnue_namer.py <nnue_filename> <hex_word_list> <core_count>

Naming works by:

• making non-functional edits to a comment string in the file header
• making edits in the output layer bytes without changing bench
• saving nets where the sha256 hash prefix matches a list of hex words