Implement user preferences and typist mode.

- NEU: Sekretariatsmodus (siehe 'Einstellungen'), um die Nachfrage nach Zusatz-Kommentaren zu unterdrücken.

zaaReloaded2/ViewModels/PreferencesViewModel.cs

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+/* PreferencesViewModel.cs
+ * part of zaaReloaded2
+ * 
+ * Copyright 2015 Daniel Kraus
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using Bovender.Mvvm;
+using Bovender.Mvvm.ViewModels;
+
+namespace zaaReloaded2.ViewModels
+{
+    /// <summary>
+    /// View model for zaaReloaded2.Preferences.
+    /// </summary>
+    public class PreferencesViewModel : ViewModelBase
+    {
+        #region Singleton
+
+        public static PreferencesViewModel Default
+        {
+            get
+            {
+                return _instance;
+            }
+        }
+
+        static PreferencesViewModel() { }
+
+        static readonly PreferencesViewModel _instance = new PreferencesViewModel();
+
+        #endregion
+
+        #region Properties
+
+        public bool SuppressItemCommentInteraction { get; set; }
+
+        #endregion
+
+        #region Command
+
+        public DelegatingCommand SaveCommand
+        {
+            get
+            {
+                if (_saveCommand == null)
+                {
+                    _saveCommand = new DelegatingCommand(
+                        param => DoSave(),
+                        param => CanSave());
+                }
+                return _saveCommand;
+            }
+        }
+
+        #endregion
+
+        #region Constructor
+
+        public PreferencesViewModel()
+        {
+            SuppressItemCommentInteraction = Preferences.Default.SuppressItemCommentInteraction;
+        }
+
+        #endregion
+
+        #region Private methods
+
+        void DoSave()
+        {
+            Preferences.Default.SuppressItemCommentInteraction = SuppressItemCommentInteraction;
+            DoCloseView();
+        }
+
+        bool CanSave()
+        {
+            return true;
+        }
+
+        #endregion
+
+        #region Field
+
+        DelegatingCommand _saveCommand;
+
+        #endregion
+
+        #region ViewModelBase implementation
+
+        public override object RevealModelObject()
+        {
+            throw new NotImplementedException();
+        }
+
+        #endregion
+    }
+}