Add pinned status refreshing

Closes #82

Tusker/Screens/Profile/ProfileTableViewController.swift

@@ -226,6 +226,24 @@ class ProfileTableViewController: EnhancedTableViewController {
                 self.refreshControl?.endRefreshing()
             }
         }
+        
+        getStatuses(onlyPinned: true) { (response) in
+            guard case let .success(newPinnedStatuses, _) = response else { fatalError() }
+            MastodonCache.addAll(statuses: newPinnedStatuses)
+            
+            let oldPinnedStatuses = self.pinnedStatuses
+            var pinnedStatuses = [(id: String, state: StatusState)]()
+            for status in newPinnedStatuses {
+                let state: StatusState
+                if let (_, oldState) = oldPinnedStatuses.first(where: { $0.id == status.id }) {
+                    state = oldState
+                } else {
+                    state = .unknown
+                }
+                pinnedStatuses.append((status.id, state))
+            }
+            self.pinnedStatuses = pinnedStatuses
+        }
     }
     
     @objc func composePressed(_ sender: Any) {