Implement better replay support

[nmlgc]

We can do better than storing a single replay per individual stage.

• [ ] Support full-game replays
• [ ] Add more metadata: Player name, timestamp, score per stage, shot type, …
• [ ] Implement a new replay menu that shows more metadata: Shot type, starting difficulty / lives / bombs, the above new metadata
  • [ ] Implement sortability by all types of metadata
  • [ ] Implement incremental search in all metadata categories
• [ ] Implement scoreboard / replay hosting support code for Silent Selene