Fix issues with contextual menu in calendars

Creating an event or a task using the contextual menu will now consider
the day and hour of the menu position (fixes #2557).
The next/previous day/month menu options have been fixed.
The menu will now disappear when clicking outside the contextual menu on
the calendar area.

UI/Templates/SchedulerUI/UIxCalMulticolumnDayView.wox

@@ -6,7 +6,7 @@
     xmlns:rsrc="OGo:url"
     xmlns:label="OGo:label">
     <a href="#"
-      class="leftNavigationArrow"
+      id="leftNavigationArrow"
       var:date="prevDayQueryParameters.day"
       onclick="return onCalendarGotoDay(this);"
       ><img rsrc:src="arrow-left.png"/></a>
@@ -34,7 +34,7 @@
             /></a></span
         ></span>
     <a href="#"
-      class="rightNavigationArrow"
+      id="rightNavigationArrow"
       var:date="nextDayQueryParameters.day"
       onclick="return onCalendarGotoDay(this);"
       ><img rsrc:src="arrow-right.png"/></a>