Modernize a PMD ruleset

Bring a PMD ruleset XML file up to date with current PMD, by updating the <rule> references and <exclude> elements to name each rule as PMD knows it today. This runs both the PMD 6 to 7 migration, which replaces the rules PMD 7 deleted and drops the ones deleted without a successor, and the PMD 7 rule renames, which adopt the current name of each rule PMD renamed within the PMD 7 line. Rules whose replacement requires a judgement call, either because PMD split one rule across several successors or because the successor reports something different, are left alone. The result requires PMD 7.27.0 or later; an earlier PMD 7 fails to load a name that its version does not know yet.