JBIDE-16094 CordovaSim: Refactoring. Adding custom scrollbars to inAppBrowser/ChildBrowser only on Windows OS
JBIDE-16094 CordovaSim: Implementing switching between BrowserSim browser and inAppBrowser via SWT StackLayout. Works on all platforms

Conflicts:
	plugins/org.jboss.tools.vpe.cordovasim/src/org/jboss/tools/vpe/cordovasim/plugins/inappbrowser/InAppBrowserLoader.java
JBIDE-16119 CordovaSim: Changing CSS cursor property when there is an ability to move the panel. Adding visual indicators to show that panels are collapsible