Remove `$tutorGraduate` global variable in favor of `needsTutoring` function.  Improve display of schoolroom remaining lessons.

When comparing a plain number to a data target in either target editor, strip the condition from the target.

- Used pop instead of splice

and fix some eslint complaints

Implements changes suggested in pregmodfan/fc-pregmod!8659 (comment 142842) and pregmodfan/fc-pregmod!8659 (comment 142794)

Move slave-scoped temporary cross-report variables out of saVars and onto a proxy object, so they get reset automatically.