Use the generated knight_moves BitBoards from bitboard::MoveLibrary to generate knight moves.
This commit doesn't yet implement computing bitboards for knight moves.
Generate moves for kings.
This struct is trying out a different approach to iterators where the type
itself isn't one, but it has an iter() method that returns an iterator over all
the move lists.
This struct also builds all the moves up front, in new() before the new instance
is returned.
Holy heck I went on a *journey* here. Ultimately, I needed to implement my own
index-based iterator instead of using the Vec's Iterator.
This type establishes some patterns I want to carry forward to other move
generators.
1. The use of a Parameters struct to fully parameterize the move generation
per-color. That lets these types only need a single color-based branch
2. A list of move lists, one list for each of captures, promotions, and quiet
moves.
3. An index-based move iterator.
4. Separate impl for generating bitboard representations of these moves
Additional changes:
- Implement BitBoard::from_square()
- Implement a Square::e5() for tests
This class doesn't implement en passant yet. It also doesn't yet have tests for
the bitboard stuff.
