Modernize (and fix) SemanticDependency

[hcooper]

Multiple users in the past few months have reported the region pages weren't showing the newest condition report date. The solution was to do a smw refresh of the canyon page.

I tracked this back to a custom extension SemanticDependency which triggers SMW updates across pages. The extension was not compatible with more modern mediawiki versions (see warning here)

This PR makes no functional difference, just modernizes/fixes the extension and adds some docs and logging.

Tested in dev setup - created condition report and confirmed "Has condition date" property on canyon was not updating, but does now.

[...]
2026-04-08 00:18:13 ropewiki_webserver ropewiki: Parser function called with page name: Cassidy Canyon
2026-04-08 00:18:13 ropewiki_webserver ropewiki: Queued page for refresh: Cassidy Canyon (total queued: 1)
2026-04-08 00:18:13 ropewiki_webserver ropewiki: PageSaveComplete hook called for page: Cassidy Canyon-20260407191102
2026-04-08 00:18:13 ropewiki_webserver ropewiki: Number of pages queued for refresh: 1
2026-04-08 00:18:13 ropewiki_webserver ropewiki: Starting update job for dependent page: Cassidy Canyon
2026-04-08 00:18:14 ropewiki_webserver ropewiki: Successfully completed update job for: Cassidy Canyon
2026-04-08 00:18:14 ropewiki_webserver ropewiki: PageSaveComplete hook completed for: Cassidy Canyon-20260407191102
[...]

Note: Extension:SemanticDependencyUpdater seems to do the same job, and is probably worth checking out once the site is running an up to date mediawiki version