added base playlist support functions

MediaBrowser.WebDashboard/Api/DashboardService.cs

@@ -517,7 +517,8 @@ namespace MediaBrowser.WebDashboard.Api
                                       "wizardstartpage.js",
                                       "wizarduserpage.js",
                                       "supporterkeypage.js",
-                                      "supporterpage.js"
+                                      "supporterpage.js",
+                                      "playlist.js"
                                   };
 
             var memoryStream = new MemoryStream();

MediaBrowser.WebDashboard/MediaBrowser.WebDashboard.csproj

@@ -213,6 +213,9 @@
     <Content Include="dashboard-ui\scripts\itembynamedetailpage.js">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Content>
+    <Content Include="dashboard-ui\scripts\playlist.js">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
     <Content Include="dashboard-ui\scripts\librarybrowser.js">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Content>