[issue2551353] Add roundup-classhelper for 2.4.0 release

New submission from John Rouillard:

This addresses a number of issues with the classic classhelper. It does not address
issues with the calendar popup that uses the same basic classhelper mechanism.

https://github.com/UMB-CS-682-Team-03/tracker was created by a team at U-Mass Boston
to upgrade an existing classhelper link using a web component. It needs access
to the rest interface to operate and it needs web component support from the browser.
If either of these fails, the component will drop back to the classic classhelper.

Get this into the 2.4.0 release. Document by updating:

  upgrading.txt
  admin_guide.txt

install in classic tracker template. It doesn't look like it's used in the minimal
template to the jinja template. devel and responsive use it, but I want to get some
experience with it and I think the classic template is more heavily used.

----------
assignee: rouilj
components: Web interface
keywords: Blocker
messages: 8056
nosy: rouilj
priority: high
severity: normal
status: new
title: Add roundup-classhelper for 2.4.0 release
versions: 2.4.0

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<https://issues.roundup-tracker.org/issue2551353>
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