Technique-based puzzle generator to-dos

[KyouyamaKazusa0805]

This issue records the detail for new APIs for generating puzzles with techniques, keeping such techniques in the first step or must contain.

To-do list:

• [x] Full House
• [x] Hidden Single
• [x] Naked Single
• [ ] Complex Singles
  • [x] Direct Intersection
  • [x] Direct Subset
  • [ ] Miscellaneous
• [ ] X-Wing
• [ ] Swordfish
• [ ] Jellyfish
• [ ] Finned/Sashimi X-Wing
• [ ] Finned/Sashimi Swordfish
• [ ] Finned/Sashimi Jellyfish
• [ ] ...
• [ ] Reverse BUG
• [ ] SK-Loop
• [ ] JE
• [ ] MSLS