Soul Shooter

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1. Add World Boss.
2. Add the ability to replay stages.
3. Add weapon upgrading system.
4. Add boss material drops.
5. Add preview for wingman.
6. Add auto-battle function for The Defense.
7. Add chips.
8. Add a third wingman slot.
9. Add difficulty selection for Endless 50.
10. Optimized the user interface.
11. Fix known bugs.