Removing singleton usage: moving all send and save logic out of the MyTracks class.

This is a non-trivial step: I decentralized dialog creation (since it made no sense to have a single place creating a lot of completely unrelated dialogs), made invisible activities just for sending/saving, and changed menu handling a bit, all to decentralize those functions from MyTracks.

There's still a TODO to handle GET_LOGIN more nicely instead of returning from the depths of auth management into the current activity.

MyTracksTest/src/com/google/android/apps/mytracks/DialogManagerTest.java

@@ -38,13 +38,6 @@ public class DialogManagerTest
     assertNull(MyTracks.getInstance());
   }
 
-  public void test_onCreateChartSettings() {
-    Dialog d =
-        getActivity().onCreateDialog(DialogManager.DIALOG_CHART_SETTINGS, null);
-    assertNotNull(d);
-    assertTrue(d instanceof ChartSettingsDialog);
-  }
-
   public void test_onCreateImportProgress() {
     Dialog d =
         getActivity().onCreateDialog(
@@ -62,11 +55,4 @@ public class DialogManagerTest
     assertEquals(100, pd.getMax());
     assertEquals(10, pd.getProgress());
   }
-
-  public void test_onCreateSendToGoogle() {
-    Dialog d =
-        getActivity().onCreateDialog(DialogManager.DIALOG_SEND_TO_GOOGLE, null);
-    assertNotNull(d);
-    assertTrue(d instanceof SendDialog);
-  }
 }