Inherits AlignmentAnnotController.
Feature:
click to align the currently selected annotations. 
Usage:
in template: 
<contextmenu-item-align-annot @controller="annot-opr:AlignAnnotController"></contextmenu-item-align-annot>
<contextmenu-item @controller="annot-opr:AlignAnnotController"></contextmenu-item>
in fragment config: 
 fragments: [{
     target: 'fv--contextmenu-item-align-annot',
     config: {
         callback: UIExtension.controllers.AlignAnnotController
     }
 }]
});