[Frontend] Dialog and overlay layout/positioning mods

open #159
open #170
Restructured overlay size and positioning approach
for better flexibility;
Getting new dialogs and the overlay to
play nicely in mobile context;

platform/commonUI/dialog/res/templates/dialog.html

@@ -23,7 +23,7 @@
     <div class="title">{{ngModel.title}}</div>
     <div class="hint">All fields marked <span class="ui-symbol req">*</span> are required.</div>
 </div>
-<div class='abs editor l-dialog'>
+<div class='abs editor'>
     <mct-form ng-model="ngModel.value"
               structure="ngModel.structure"
               name="createForm">