Milthm

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This update includes two new songs:
1. "Agnostic" by AiSS
2. "Kagetsu" by Kirara Magic
Along with other bug fixes and feature enhancements:
1. Fixed the issue with abnormal initial sighting effects in "Sundown".
2. Fixed issues with some chart animations not displaying correctly.
3. Added DSP Buffer Size auto-detection tool.
4. Fixed issues with the Drizzle chart in "Sparkrain".