Update log:
- Fixed all hitsounds delay.
- Fixed missing hitsounds in Normal mentioned by 01.
- Fixed green line snap in Extra mentioned by Underforest.
- Added storyboard.
- Remapped some building up parts in Extra.
- Remapped multi-repeated sliders in Normal.
- Applied changes for yf_bmp.
- Changed overall difficulty of Skystar's Extra to 8 upon his request.