Function shorten_subject

Shorten a subject + internationalization concerns.

shortens a subject so that it is either shorter than length, or that length plus an ellipsis.
respects internationalization characters and entities as one character.
avoids trailing entities.
returns the shortened string.

Package: SMF
Copyright: 2020 Simple Machines and individual contributors
License: BSD
Author: Simple Machines https://www.simplemachines.org
Located at Sources/Subs.php

Parameters summary
`string`	`$subject`	The subject
`integer`	`$len`	How many characters to limit it to

Return value summary
`string`	The shortened subject - either the entire subject (if it's <= $len) or the subject shortened to $len characters with "..." appended

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Function shorten_subject