general:
- Refactoring of skills to support larger histories + inter-skill interactions ppy/osu#18368 ppy/osu#1845)
osu:
- Make speed skill consider only shortest jump distance from sliders ppy/osu#15758.
- Remove flashlight strain decay factor ppy/osu#15728.
- Fix cumulative strain time calculation in flashlight skill ppy/osu#15867.
- More accurate calculation of effective miss count ppy/osu#16331.
- Consider hitobject opacity in flashlight skill ppy/osu#15665.
- Improved double tap detection in speed skill ppy/osu#18692.
- Remove difficulty spike nerf from Flashlight skill ppy/osu#18791.
- Change speed accuracy scaling to be closer to worst case scenario ppy/osu#15035.
- Remove non-overlapping velocity buff from Aim ppy/osu#19004.
- Add slider bonus to flashlight skill ppy/osu#15666.
- Balancing ppy/osu#19001.
- Clamp effective miss count to max number of possible breaks ppy/osu#19804.
- Nerf repeated angles in flashlight skill ppy/osu#19716.
- Fix relevant note count summation ppy/osu#20033.
taiko:
- Rewrite of the Stamina skill ppy/osu#18208.
- Balancing ppy/osu#19181.
- Taiko rewrite of the Colour skill ppy/osu#19571.
mania:
- Fix SR inflation for hold note releases in quick succession ppy/osu#17913.
- Use accuracy instead of score to calculate PP ppy/osu#18749.
- Fix SR varying by order of notes in a chord ppy/osu#19120.