osu!taiko simplify pp summing and make performance attributes accurate

[buyaspacecube]

This change replaces the (diff^1.1 + acc^1.1)^1/1.1 formula applied to pp with simply diff+acc, adjusting multipliers for minimal value changes. Taiko's acc values being lower than difficulty on every single play bar a few exceptions means that all this formula did was make acc have even less of an effect on a play's total pp. This is another step towards the larger acc rebalance we have planned for next deploy. Multipliers have also been moved around so that the Difficulty and Accuracy performance attributes always add up to make Total. The approved but not yet merged change to remove multipliers to the Easy mod is also included, hope that doesn't cause trouble merging this

[Lawtrohux]

as discussed, happy with the changes. once we get everything in we can start balancing, however values look good with and without.

[stanriders]

Conflicts