Kill "HTT" from the name of everything

Merged Jahred Adelman requested to merge jahreda/athena:Kill-HTT into master

HTT goes away in our simulation. It's all EFTracking simulation now.

No practical changes and no changes to code. Just renaming files and folders and changing copyright dates. At some point this will be problematic to do because we will have files with objects that have these names. We don't really have ones that we're using. Yet. But we hope to soon.

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