Has previously been discussed internally. Probably good to get this out
before the next full reprocess of scores server-side.
The multiplier here was @smoogipoo's suggested value. I'd be willing to
go lower if this is seen at too high, but it should be a round number to
make it easy for users to understand the max score available to them.
In order to make `highlightedColour` dependent on the mod type color, the color is converted to an `osu.Framework.Graphics.Colour4` and calls `Lighten`.