Matching osu!stable. I use these quite a lot while mapping and I'm sure
others do as well.
Hold `Shift` = invert grid snap
Hold `Alt` = invert distance snap
Scroll speed is not saved and doesn't affect gameplay.
It is purely a feature for a better visualization.
It is currently bind to scroll speed increase/decrease.
Default F3/F4 crashes with editor shortcuts so it has to be changed.
While osu!catch also implements a distance snap grid, it doesn't rely on
`GetBeatSnapDistanceAt` (unlike osu!), therefore it can't have the
"distance spacing" multiplier yet.