fix scrollbar on iOS always show if not disable scroll

Fix crash when `prompt` was called on Android Q.

Fix crash on nil/invalid URL (iOS)

Fix config options for Android release builds

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

Using reflection was not a good idea because when the Android App is
compiled for release mode, some code optimizations are executed. The
fields of the configuration classes were then renamed and the mapping
via reflections did not work again. Now everything has an explicit
mapping form the untyped HashMap to the class fields and vice versa.

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

updated ChromeSafariBrowser class, Renamed Chrome Custom Tab addShareButton option to addDefaultShareMenuItem, Renamed ChromeSafariBrowser onLoaded to onCompletedInitialLoad, Renamed all iOS and Android webview options class, fix #229, Added packageName and keepAliveEnabled ChromeCustomTab options for Android

fix #225, merged #228, updated ios options naming, updated default value for databaseEnabled android option, added new methods and events

updated DropDown workaround: load it as soon as possible and load also for iframes where possibile (same origin)

Added enableDropDownWorkaroud webview option for Android to enable a temporary workaround for html dropdowns (issue #182)

Fixes null error when calling getOptions for InAppBrowser class

updated shouldOverrideUrlLoading event for #146, added print method and event #128, fix #123 javascript handler for Android API <= 22, renamed onTargetBlank to onCreateWindow event, deleted useOnTargetBlank option, added supportMultipleWindows android option, added getDefaultUserAgent static method, Updated default value for domStorageEnabled option to true

updated shouldOverrideUrlLoading event for #146, added print method and event #128, fix #123 javascript handler for Android API <= 22, renamed onTargetBlank to onCreateWindow event, deleted useOnTargetBlank option, added supportMultipleWindows android option, added getDefaultUserAgent static method, Updated default value for domStorageEnabled option to true

updated shouldOverrideUrlLoading event for #146, added print method and event #128, fix #123 javascript handler for Android API <= 22, renamed onTargetBlank to onCreateWindow event, deleted useOnTargetBlank option, added supportMultipleWindows android option, added getDefaultUserAgent static method, Updated default value for domStorageEnabled option to true

updated README.md and issue templates, added WebStorage.getInstance().deleteAllData() to clearAllCache on Android

Added pause and resume methods for Android, Added pauseTimers and resumeTimers methods, Added new historyUrl optional parameter only for Android, fix #202, should fix #201