added new interface for popovermanager; Expanded popovermanager to support 3 types of popups

The PopOverManager had support for 2 types of popups : "Modal" and "PopUp". Both had a blocker Element which was used to prevent user action or to determine action outside the popup. With this pull request we added support for a third kind of popup : "Info".
The Info popup has no blocker element and it should not prevent user interaction.