All circles mod (converts sliders into circles)

[Potenchill]

This mod converts slider objects into circles.

Before

osu._DpuxTbGGPD.mp4

After

osu._tUXtVxXdFB.mp4

After with slider end/repeat conversion

osu._g5BWpRnESR.mp4

Likely needs a name, acronym, and description change, and suggestions are welcome. (OnlyCircles?) Please let me know if there's anything else.

[Utiba]

Wow, this is actually so cool. Definitely would be fun to have in lazer!

[GabuTheDev]

Likely needs a name, acronym, and description change, and suggestions are welcome. (OnlyCircles?) Please let me know if there's anything else.

Circles only [CO] would be the most straightforward naming, similar to Strict Tracking or Single Tap.
Something more interesting would be Staccato (a term used in music to mention the shortening of a note) but while it sounds interesting, it's not as straightforward, maybe hard to pronounce and the [ST] acronym is not available.

As for the description, I thought of: "Sliders? Never heard of them."

[Potenchill]

Something more interesting would be Staccato

Staccato's definitely a fun one, but yeah I think recognizability and the most straightforward acronym being unavailable is an issue. "Circles Only" is definitely a contender

As for the description, I thought of: "Sliders? Never heard of them."

Love it.

[peppy]

We already have "AC" (Accuracy Challenge) so "CO" is probably better (overlaps with mania COver mod, but probably fine).

[Potenchill]

I've updated the name to now be "Circles Only", acronym is "CO" and description is "Sliders? Never heard of them." Clarified what the mod setting does a bit as well.

About the tests, I saw TestCreateNewDifficultyWithScrollSpeed_DifferentRuleset failed on single-threaded Linux and Windows before this change, although I'm not entirely sure why. https://github.com/ppy/osu/runs/36333043478#r3s0

As long as the tests and "CO" acronym is fine, and no other issues pop up, that should be all, but it seems switching modes between mania and standard with either mod on with this acronym enables Cover when switching to mania or Circles Only when switching to standard. Might be out of scope for this PR, though?

[Potenchill]

Found and fixed two issues while messing with it, haven't encountered anything else so please let me know if any other issues crop up.