PHP7-ify the Order Line classes
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GitLab (git.doit.wisc.edu) has been upgraded to version 17.10.4. For more, see: https://about.gitlab.com/releases/2025/03/20/gitlab-17-10-released/
This PR gets the Order Line classes written in PHP7 style for better type hinting, error checking, etc. I'll be going through the rest of the classes doing the same, but doing separate PRs for each so that there aren't 20+ changed files.
Please review: @ahoffmann @weizhong-wang @lloyd-carter @KJOYNER