refs #235 - fixed 'Display Name', saving empty value
refs #235 - fixed saving of empty End row and End column
refs #235 - added showing of enlarged image by selecting menu item from Screen Preview view menu
refs #235 - fixed NPE when trying to open Window->Show View on OpenLegacy perspective
refs #235 - implemented marking rectangle on ScreenPreview by double click or dragging mouse
refs #235 - added getting values of left side field from selected rectangle
refs #235 - added support for new attributes added lately to @ScreenField. Added additionalKey column to Actions tab
refs #235 - added support of ScreenDescriptionField annotation
refs #235 - changed label of selection on ScreenPreview
refs #235 - added ability to draw several rectangles on screen preview in the same time
refs #235 - merge FB_EDITOR_IMPROVEMENTS