Fix mania score conversion using score V1 accuracy

[bdach]

Partially addresses #26416

As pointed out in the discussion thread above, the total score conversion process for mania was using accuracy directly from the replay. In mania accuracy is calculated differently in score V1 than in score V2, which meant that scores coming from stable were treated more favourably (due to weighting GREAT and PERFECT equally).

To fix, recompute accuracy locally and use that for the accuracy portion.

Note that this will still not be (and cannot be made) 100% accurate, as in stable score V2, as well as in lazer, hold notes are two judgements, not one as in stable score V1, meaning that full and correct score statistics are not available without playing back the replay.

The effects of the change can be previewed on the following spreadsheet:

https://docs.google.com/spreadsheets/d/1wxD4UwLjwcr7n9y5Yq7EN0lgiLBN93kpd4gBnAlG-E0/edit#gid=1711190356

Top 5 changed scores with replays:

score	master	this PR	replay
Outlasted on Uwa!! So Holiday by toby fox [[4K] easy] (0.71*)	935,917	927,269	920,579
ag0 on Emotional Uplifting Orchestral by bradbreeck [[4K] Rocket's Normal] (0.76*)	921,636	913,535	875,549
rlarkgus on Zen Zen Zense by Gom (HoneyWorks) [[5K] Normal] (1.68*)	934,340	926,787	918,855
YuJJun on Harumachi Clover by R3 Music Box [4K Catastrophe] (1.80*)	918,606	911,111	885,454
Fritte on 45-byou by respon feat. Hatsune Miku & Megpoid [[5K] Normal] (1.52*)	900,024	892,569	907,456

4/5 cases are closer to the "actual" score as indicated by replay than the previous conversion was (although that is a somewhat shaky reference due to differences in hitwindow handling, but it'll do for now).

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This will 10000% conflict with #26405 if both pulls are accepted. I will deal with that as that comes.

I didn't do what I described here exactly because I dunno it felt safer to preserve the original accuracy I guess. I'm not exactly sure that for other rulesets recomputing accuracy from statistics is lossless (or matches actual lazer gameplay mechanics either).

Classic mod multiplier is deliberately not touched. It will remain 0.96x for all rulesets for the foreseeable future. That may change if the community feedback after release indicates that it is required, but for now it stays. Changing multiplier is a much easier operation to apply retroactively than adjusting the conversion which is why this is being PRed and that isn't.

[RubiksImplosion]

I don't see the point of doing score conversion for mania if a 0.96 multiplier is going to be applied. The 960000 point cap a 0.96 multiplier enforces results in even the best plays on maps being easily beatable. This will result in the stable scores on the leaderboards for all but the hardest of maps being effectively erased once objectively worse lazer plays populate it.

[bdach]

Please re-read the last sentence of the PR description.

[peppy]

Please refrain from discussing the multiplier. This is locked in for release and subject to future revisiting, as mentioned in the OP and mentioned above. Give us space to develop or we will be forced to limit interactions in the repository.

[peppy]

This makes sense to me.