[feature] Client API endpoints + v. basic web view for pinned posts (#1547)

* implement status pin client api + web handler

* make test names + comments more descriptive

* don't use separate table for status pins

* remove unused add + remove checking

* tidy up + add some more tests

web/source/css/profile.css

@@ -271,7 +271,7 @@ main {
 	box-shadow: $boxshadow;
 }
 
-#recent {
+#recent, #pinned {
 	display: flex;
 	flex-direction: row;
 	align-items: center;

web/template/profile.tmpl

@@ -53,6 +53,18 @@
             </div>
         </div>
     </div>
+        {{ if .pinned_statuses }}
+        <h2 id="pinned">
+            <span>Pinned toots</span>
+        </h2>
+        <div class="thread">
+            {{ range .pinned_statuses }}
+            <div class="toot expanded">
+                {{ template "status.tmpl" .}}
+            </div>
+            {{ end }}
+        </div>
+        {{ end }}
     <h2 id="recent">
         <span>Latest public toots</span>
         {{ if .rssFeed }}