Remove autosave timeout and simplify window closing

The changes remove a 500ms autosave delay mechanism and simplify how the
window closes by using the base implementation.

Author: lainsce

src/MainWindow.vala

@@ -183,8 +183,7 @@ namespace Notejot {
 
             tview_model.repository.save.begin ();
 
-            this.dispose ();
-            return true;
+            return base.close_request ();
         }
 
         // IO?

src/ViewModels/NoteViewModel.vala

@@ -104,13 +104,7 @@ public class Notejot.NoteViewModel : Object {
     }
 
     void save_notes () {
-        if (timeout_id != 0) {
-            Source.remove (timeout_id);
-        }
-        timeout_id = Timeout.add (500, () => {
-            timeout_id = 0;
-            repository.save.begin ();
-            return Source.REMOVE;
-        });
+        timeout_id = 0;
+        repository.save.begin ();
     }
 }

src/ViewModels/NotebookViewModel.vala

@@ -54,13 +54,7 @@ public class Notejot.NotebookViewModel : Object {
     }
 
     void save_notebooks () {
-        if (timeout_id != 0)
-            Source.remove (timeout_id);
-
-        timeout_id = Timeout.add (500, () => {
-            timeout_id = 0;
-            repository.save.begin ();
-            return Source.REMOVE;
-        });
+        timeout_id = 0;
+        repository.save.begin ();
     }
 }

src/ViewModels/TrashViewModel.vala

@@ -107,13 +107,7 @@ public class Notejot.TrashViewModel : Object {
     }
 
     void save_trashs () {
-        if (timeout_id != 0)
-            Source.remove (timeout_id);
-
-        timeout_id = Timeout.add (500, () => {
-            timeout_id = 0;
-            repository.save.begin ();
-            return Source.REMOVE;
-        });
+        timeout_id = 0;
+        repository.save.begin ();
     }
 }