Reverted calling handler.post on Android when a WebView is created, Fixed iOS extra bottom padding when opening the keyboard, fix #429

>  onLongPressHitTestResult event, updated test cases, fixed Promise polyfill, fixed android options

code refactoring, added InAppBrowserManager and ChromeSafariBrowserManager classes on native code, updated webview options class names

Fixed error 'java.lang.ClassCastException:  cannot be cast to android.view.WindowManagerImpl' on Android when using native alert dialogs, updated README.md with Xcode version required

Added shouldInterceptAjaxRequest, onAjaxReadyStateChange, onAjaxProgressEvent and shouldInterceptFetchRequest events, added useShouldInterceptAjaxRequest and useShouldInterceptFetchRequest webview options, updated node.js server test, added injectJavascriptFileFromAsset and injectCSSFileFromAsset methods, renamed some methods

updated webview options classes, fixed debuggingEnabled, added getTRexRunnerHtml and getTRexRunnerCss methods

Added new WebView option minimumFontSize, Added new Android WebView options, Added new iOS WebView options, Added onGeolocationPermissionsShowPrompt event and GeolocationPermissionShowPromptResponse class (available only for Android), updated Android ContentBlocker, updated Android build.gradle compileSdkVersion 29

added onDownloadStart event, onLoadResourceCustomScheme event and resourceCustomSchemes option, onTargetBlank event and useOnTargetBlank option, code refactoring

added support for iOS inline native WebView integrated in the flutter widget tree (#18, #45), fix #54 #38 #26 #32 #33 #29 #15