Let template calls nest deeper, set from the ACP

[bonelifer]

A template call written in an article, and a parameter's default value ({{{name|...}}}), may now hold other calls 8 levels deep. It was 3 for calls and 1 for defaults. Template nesting depth under Extensions > Wiki > Settings changes it, from 3 to 20. Deeper calls show as written.

Saved articles need reparsing to follow a new depth. A new cron task does that 50 articles at a time on ordinary page views, after this update and after each change of the setting. The settings page shows a note while it is running. When it finishes, the category memberships are worked out again, since a call that is now read (or no longer read) can add or drop a category.

The reparse can't run in the migration: the wiki's listeners aren't loaded while the extension is being enabled, so a reparse there would turn every article's headings and templates into plain text. The migration only queues it. This update also gets the call forms added in #87 ({{formatnum:}}, {{#rel2abs:}} and others) reparsed in existing articles. The README's older "run the reparser after upgrading" notes now point to the background reparse.

Testing:

• Unit tests for the limit at 8, the setting at 3 and 9, the depth range and the reparse queue. The suite passes on phpBB 3.3 and 4.0.
• Claude timed the call pattern on large test articles at depths 3 to 20: under 1 ms in every case.
• On a 3.3 test board, Claude put the board back to its pre-update state and ran the update. The reparse turned a 6-deep call into a call and kept every other article's templates and headings. Lowering the setting to 3 turned the call back into text, and raising it to 8 brought it back. An article whose deep call adds a category joined that category after the reparse.
• On a 4.0 test board, Claude ran the update and the reparse; no markup was lost.

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Investigated and written by Claude on behalf of William Jacoby (bonelifer).

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