Updated onCreateWindow, onJsAlert, onJsConfirm, and onJsPrompt webview events, added onCloseWindow, onTitleChanged, onWindowFocus, and onWindowBlur webview events, added androidOnRequestFocus, androidOnReceivedIcon, androidOnReceivedTouchIconUrl, androidOnJsBeforeUnload, and androidOnReceivedLoginRequest Android-specific webview events, fix #403