Option to disable Kiai Flashing

[OtavioBaltrusch]

Just to preface, I've seen a discussion on this but it was months ago and had no answer so I'm not sure if I'm meant to keep waiting for a response to that one or if I could create a new one so if I shouldn't be creating a new one I'm happy to delete this.

Could we add a toggle for disabling Kiai flashing? I'm somewhat sensitive to light and this makes me almost unable to play DT since the flashing on high BPM and high AR messes my vision up so bad.

I've seen two PRs in the past that were trying to accomplish this and the response to the first one was "We don't want a on-off switch, make it a slider" and then a slider was created and the response was "We don't like how it looks when you decrease the intensity" and both were rejected, so I'm just confused, do we want this or not? It seems like such a harmless change, it shouldn't provide anyone any advantages but rather take away disadvantages on certain players, what is the problem with it?

I'm happy to make a new PR myself and make sure to implement it across all gamemodes as well as follow the naming conventions as I saw that was one of the problems with the first PR, just wanted to know if it's worth spending time on or if it will just be rejected.

[smoogipoo]

Related discussion can be found here: ppy/osu-stable-issues#390