Self-hosted in-app updater for Android Flutter apps. Version check, download, sha256 verify, REQUEST_INSTALL_PACKAGES one-tap install. Changelog excerpt: - Add dartdoc comments to all public APIs (`UlakUpdater`, `UlakUpdaterConfig`, `UlakUpdaterCopy`, `UpdateGate`, `ReleaseInfo`, `UpdateState`and subclasses, `UpdateFailure`and subclasses). - Replace deprecated `ThemeData.dialogBackgroundColor`with `dialogTheme.backgroundColor`in bundled dialogs. - Add missing trailing commas across the package.