Version 9.0 of Yii View package was released.

• added View::getLocale() and WebView::getLocale() methods;
• added immutable method ViewInterface::withTheme();
• deprecated ViewInterface::withDefaultExtension() and ViewInterface::getDefaultExtension() in favor of withFallbackExtension() and getFallbackExtensions();
• adjusted config to make View and WebView more configurable;
• made fallback extension configurable & support multiple fallbacks;
• added types to ViewInterface::setParameter() and ViewInterface::addToParameter() parameters;
• made event dispatcher in View and WebView optional;
• made base path in View and WebView optional;
• fixed signature of CachedContent::cache();
• fixed reset config for referenced definitions;
• fixed render templates that contain dots in their name.