JBIDE-15678 Wrong menu items in menu "Edit" and context menu when Visual Page Editor opened with .xhtml file

In order to show actions "Mark as Deployable" and "Unmark as Deployable" only in Package Explorer
DeployAction transformed to handler, added UndeployHandler class, extension point "org.eclipse.ui.popupMenus" transformed to extension point "org.eclipse.ui.munus"