Add multiple display modes (including circle gameplay) to latency certification

[peppy]

Scrolling mode will follow but be very similar in implementation if there's no issues with this one.

[peppy]

Unsure whether to leave UR showing or not, pending @smoogipoo feedback I guess.

I'd prefer to remove it for the initial release to keep things simple, but don't mind too much either way.

[frenzibyte]

On extreme settings, the circle could conflict with the "here" linked label:

Also settings appear on results screen as well, conflicting with the continue button:

Probably should hide there instead.

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Requesting change for the latency mode cycling logic, as that causes a crash when a user presses Space twice. Other suggestions are minor.

[peppy]

On extreme settings, the circle could conflict with the "here" linked label:

probably fine for now.

other issues should be fixed.

[frenzibyte]

I personally think it's fine showing UR, don't see it as a factor that makes the test easier/harder. All looking good to me.

[smoogipoo]

Tending to remove the UR meter, but only because it doesn't seem to be adding much value to my rudimentary tests, due to not having something to keep timing with (i.e. audio). Can go in as-is as it wouldn't be a detriment to the test as far as I can tell.

[peppy]

I think I'll remove initially. I'll mention in the FAQ and we can add back if there's demand.