Fix instant spinners giving insane amounts of strain

[stanriders]

Fixes maps such as https://osu.ppy.sh/beatmapsets/814850#osu/1901200 (9.98* -> 6.54*)
https://osu.ppy.sh/beatmapsets/388378#osu/847257 (13.88* -> 6.20*)

Should not affect normal maps, even extremes such as https://osu.ppy.sh/beatmapsets/132#osu/296

[bdach]

the modified block of code - as far as i can gather - is trying to calculate an angle between three subsequent positions. would it not make more sense to not run any of it if any of the three objects involved was a spinner?

i'm especially thinking about lastLastObject potentially being a spinner as well. it's just a thought that occurred to me given that there are two disparate spinner checks (one nested in the other to boot) which seem to unnecessarily complicate the code when a potentially simpler alternative would be to discount the entire three-object sequence based on the presence of a spinner.

[stanriders]

Yeah that makes sense

[joseph-ireland]

It was mentioned on discord that this still leaves room for StrainTime to give speed PP. Maybe a better approach is to filter out spinners from OsuDifficultyCalculator so they're fully excluded from all skills. Seems all the skills were trying (unsuccessfully) to filter them out anyway.

[smoogipoo]

Spreadsheet of SR changes (PP changes not listed).

Looks good to me.