Change miss penalty curve for speed and aim pp awarded in the osu! ruleset

[Xexxar]

Hello! This change is part of my goal of revitalizing the existing pp system in an effort to keep the competitive scene alive. This is the third (and final) hotfix I plan to create a MR for. I have future plans to look at star rating, but for now, the sum of all three of my proposals will serve as a good refresh for the competitive scene.

The Problem
Currently in PP, there exists a curve for miss count and for combo. Though the combo curve is problematic too, the focus of this MR is on the penalty for misses. Currently, the implementation is:

            // Penalize misses exponentially. This mainly fixes tag4 maps and the likes until a per-hitobject solution is available
            aimValue *= Math.Pow(0.97, countMiss);

which I believe the comment speaks for itself as to how old this implementation is. The problem with this implementation is that it simply reduces pp by a function of missCount, completely ignoring the number of objects in the map. 3 misses on a 100 note map certainly deserve to be penalized harder than 3 misses on a 1000 note map.

Proposal
I have created a new curve that scales much more dynamically with object count. No matter how many objects, the curve will automatically reduce pp by 3% for having any number of misses, and from there scales depending on the number of total objects in the map. The curve can be viewed below. The l slider is the number of objects, and the X-axis is the number of misses. Visible is the existing curve in green and the new curve in purple.

Curves: https://www.desmos.com/calculator/rshij9757a

The goal of this change is to penalize misses on short maps more, while reducing the impact of having more than 1 misses on longer maps. This way, plays that are 3000 notes where someone accidently wiffed a stream do not lose 1 - .97^5 pp. The purpose for defaulting a 3% penalty for missing is to encourage S-ranks and discourage players from accepting 1 miss plays.

Results
Below are profiles featuring all 3 of my MR's (AR11 Nerf, Speed Accuracy Change, and this).

Aetrna: https://cdn.discordapp.com/attachments/105047038915256320/786695258650050590/aetrna.txt
Vaxei: https://cdn.discordapp.com/attachments/105047038915256320/786695327482642503/vaxei.txt
Whitecat: https://cdn.discordapp.com/attachments/105047038915256320/786695344078979083/whitecat.txt
Chocomint: https://cdn.discordapp.com/attachments/105047038915256320/786696195149266985/chocomint.txt
Badeu: https://cdn.discordapp.com/attachments/105047038915256320/786696339568197663/badeu.txt
idke: https://cdn.discordapp.com/attachments/105047038915256320/786696491929436200/idke.txt
mrekk: https://cdn.discordapp.com/attachments/105047038915256320/786697229695320075/mrekk.txt
ryuk: https://cdn.discordapp.com/attachments/105047038915256320/786697263274524713/ryuk.txt

This MR is a little shorter, if there are reqs for more information or details, please feel free to comment. Thanks for reading.

[smoogipoo]

Minor codestyle / CI nits.

Looks well-reasoned otherwise.

[smoogipoo]

CI fixes

[Xexxar]

merged in that change to add Math.Pow(countmiss, .75) to speedPP multiplier. Vals look relatively the same, though maps like Aetrna's play on sidetracked day are +80, not +40, which I like more anyway.

EDIT: rebalanced the .75 to .875

[smoogipoo]

A little bit of discussion happened in discord and it seems fine now.