Started working on the ability to select multiple items from the menu (which...

Started working on the ability to select multiple items from the menu (which is done with the spacebar).  Multi-item selection is enabled by setting the multiSelect property to true (which is false by default).  In multi-select mode, the GetVal() function will return an array of selected return values rather than a string.  The display of selected items still needs to be worked on..  Right now it will display a check mark next to selected items after the user scrolls away from the item, and the position of the check mark is currently a little wierd, but multi-select is working.