Move actions to app bar on home screen

lib/screens/home.dart

@@ -11,29 +11,37 @@ class HomeScreen extends StatelessWidget {
     return Scaffold(
       appBar: AppBar(
         title: Text('Musicus'),
+        actions: <Widget>[
+          PopupMenuButton(
+            icon: const Icon(Icons.more_vert),
+            itemBuilder: (context) => [
+              PopupMenuItem(
+                value: 0,
+                child: Text('Start player'),
               ),
-      // For debugging purposes
+              PopupMenuItem(
-      body: ListView(
+                value: 1,
-        children: <Widget>[
+                child: Text('Add work'),
-          ListTile(
-            title: Text('Start player'),
-            onTap: backend.startPlayer,
               ),
-          ListTile(
+            ],
-            title: Text('Play/Pause'),
+            onSelected: (selected) {
-            onTap: backend.playPause,
+              if (selected == 0) {
-          ),
+                backend.startPlayer();
-          ListTile(
+              } else if (selected == 1) {
-            title: Text('Add work'),
+                Navigator.push(
-            onTap: () => Navigator.push(
                   context,
                   MaterialPageRoute(
                     builder: (context) => WorkEditor(),
                     fullscreenDialog: true,
-                )),
-          ),
-        ],
                   ),
                 );
               }
+            },
+          ),
+        ],
+      ),
+      // For debugging purposes
+      body: Container(),
+    );
+  }
 }