Replace AAA, AAAA, and AAAA rankings

[Jaldabo]

What feature do you want to get added on the base engine?

The current ranking system is more accurate to how KE handled it, yes, but S and SS rankings would shorten the info bar slightly. It's also more universal with other rhythm games, so I don't see why not. :)

Also just personal preference but the 69% gimmick rating doesn't really work if there isn't a 'nice' rating, so new rankings would be:

['F', 0.2], //From 0% to 19%
['E', 0.4], //From 20% to 39%
['D', 0.5], //From 40% to 49%
['C', 0.6], //From 50% to 59%
['B', 0.7], //From 60% to 69%
['A', 0.8], //From 70% to 79%
['S', 0.9], //From 80% to 89%
['SS', 1], //From 90% to 99%
['SSS', 1], //100%

Again, just a suggestion to clean things up. I could do a PR if this suggestion is approved.

To test your sight, and reliability, please select the option of what should NOT be requested.

6K+ support.