Add new helpers for configuration and localization management - Introduced `ConfigKeyMigrator` to facilitate key renaming in YAML configuration files while preserving comments and formatting. - Added `FileChangeTracker` to monitor changes in plugin data files, providing detailed reports on modifications after reloads. - Implemented `LegacyDataUpgrade` for one-time upgrades of plugin data folders, ensuring user settings are retained while migrating to new formats. - Created `LocaleFileChecker` to validate localization files against a base locale, ensuring consistency and correctness in translations.
Added documentation for various helpers: Getting started guide, ConfigWatcher, LangLoader, MessageService, ServerMatcher, StartupBanner, UpdateChecker, and VersionComparator.