remove the SC Enum aliases

[benjones]

Follow up to #14399
I removed the first ~5 of the enum aliases here and the diff was big enough that I figured I'd spread it across a couple of PRs. I also replaced entire switch/case blocks using the ones I removed, and other easily visible nearby uses of SCxxx enums.

[benjones]

@dlang-bot ??

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Testing this PR locally

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[benjones]

@dkorpel looks like the bot didn't assign reviewers, but since this is followup to your PR, you're probably the right person to look.

[thewilsonator]

Looks good. You might want to do all of them at once and add the resulting commit to the git blame ignore revs list.

[benjones]

Looks good. You might want to do all of them at once and add the resulting commit to the git blame ignore revs list.

I removed the rest of the aliases in a second commit. I can squash them if you want. It doesn't look like there's a blame ignore revs file yet, should I add one to the root of the repo?

[thewilsonator]

I can squash them if you want.

Yes please.

should I add one to the root of the repo?

Yes.

[benjones]

@thewilsonator Done

[benjones]

@RazvanN7 bump