Chess player/Move generation

Chess player/Move generation is a draft programming task. It is not yet considered ready to be promoted as a complete task, for reasons that should be found in its talk page.

This is a sub-task of the Chess player task.

Using suitable data structures, generate a list of valid moves given a chess game position and the side-to-move. You can create a basic (and incomplete) solution or create an advanced solution which covers all possible moves and depends on tracking more of the game state.

Basic implementation:

1. Moves based on piece type
2. Simple promotion
3. Allow resignation

More advanced/full implementation:

1. Castling (not through check)
2. En-passant capture
3. All promotions
4. Move legality for moving in/out of check
5. Draw by repetition and 50-move rule

Explain how complete your solution is, and try to create a self-contained component which could be used by a complete chess program.