[FEATURE] Implement a Move Picker

[DeveloperPaul123]

Implement a move picker that supplies the "next" move to search in move ordering.

Rustic talks about this. The gist is that this is "better" because it saves you on sorting the entire list when most moves won't be used; so instead you do an incremental sort to get the next move to search.

[DeveloperPaul123]

Basically done in #93 , but wasn't explicitly labeled as a "Move picker". We can look at improving the incremental sort performance at a later time. See this article.