Use one-time bindings in annotation templates for immutable expressions

Use one-time bindings in the annotation component's template
for expressions whose values cannot change during the lifetime
of an annotation card.

Testing using the default /stream view, without scrolling:

Initial status as of 1ceb5fcefd7fa057bdbcf1f73df57d007289531f averaged
over 30+ digest cycles:

 Digest cycle: ~30ms
 Watchers: 1686

With this commit:

 Digest cycle: ~26ms
 Watchers: 1649

h/templates/client/annotation.html

@@ -9,7 +9,7 @@
       <span>
         <a class="annotation-user"
            target="_blank"
-           ng-href="{{vm.baseURI}}u/{{vm.user()}}"
+           ng-href="{{::vm.baseURI}}u/{{vm.user()}}"
            >{{vm.user() | persona}}</a>
       </span>
 
@@ -33,11 +33,11 @@
         <i class="h-icon-border-color" ng-show="vm.isHighlight() && !vm.editing()" title="This is a highlight. Click 'edit' to add a note or tag."></i>
         <span class="annotation-citation"
               ng-bind-html="vm.document() | documentTitle"
-              ng-if="!vm.isSidebar">
+              ng-if="::!vm.isSidebar">
         </span>
         <span class="annotation-citation-domain"
               ng-bind-html="vm.document() | documentDomain"
-              ng-if="!vm.isSidebar">
+              ng-if="::!vm.isSidebar">
         </span>
       </span>
     </span>
@@ -49,7 +49,7 @@
        target="_blank"
        title="{{vm.updated() | moment:'LLLL'}}"
        ng-if="!vm.editing() && vm.updated()"
-       ng-href="{{vm.baseURI}}a/{{vm.id()}}"
+       ng-href="{{::vm.baseURI}}a/{{vm.id()}}"
        >{{vm.timestamp}}</a>
   </header>
 

h/templates/client/thread.html

@@ -15,7 +15,7 @@
          name="annotation"
          annotation="vm.container.message"
          is-last-reply="$last"
-         is-sidebar="isSidebar"
+         is-sidebar="::isSidebar"
          annotation-show-reply-count="{{vm.shouldShowNumReplies()}}"
          annotation-reply-count="{{vm.numReplies()}}"
          annotation-reply-count-click="vm.toggleCollapsed()"

h/templates/client/top_bar.html

@@ -2,7 +2,7 @@
 !-->
 <div class="top-bar" ng-class="frame.visible && 'shown'" ng-cloak>
   <!-- Legacy design for top bar, as used in the stream !-->
-  <div class="top-bar__inner content" ng-if="!isSidebar">
+  <div class="top-bar__inner content" ng-if="::!isSidebar">
     <simple-search
       class="simple-search"
       query="searchController.query"
@@ -23,7 +23,7 @@
        The inner div is styled with 'content' to center it in
        the stream view.
   !-->
-  <div class="top-bar__inner content" ng-if="isSidebar">
+  <div class="top-bar__inner content" ng-if="::isSidebar">
     <group-list class="group-list" auth="auth"></group-list>
     <div class="top-bar__expander"></div>
     <simple-search