New Database settings page

Implements Recycle Bin (new group creation still needs to be implemented)
Code refactoring

ModernKeePass/ViewModels/SettingsDatabaseVm.cs

@@ -0,0 +1,67 @@
+using System;
+using System.Collections.ObjectModel;
+using System.Linq;
+using Windows.Storage;
+using Windows.UI.Xaml;
+using ModernKeePass.Common;
+using ModernKeePass.Interfaces;
+
+namespace ModernKeePass.ViewModels
+{
+    public class SettingsDatabaseVm: NotifyPropertyChangedBase, IHasSelectableObject
+    {
+        private readonly App _app = (App)Application.Current;
+        private readonly ApplicationDataContainer _localSettings = ApplicationData.Current.LocalSettings;
+        private GroupVm _selectedItem;
+
+        public bool HasRecycleBin
+        {
+            get { return _app.Database.RecycleBinEnabled; }
+            set
+            {
+                _app.Database.RecycleBinEnabled = value;
+                OnPropertyChanged();
+            }
+        }
+
+        public ObservableCollection<GroupVm> Groups { get; set; }
+
+        public ISelectableModel SelectedItem
+        {
+            get { return Groups.FirstOrDefault(g => g.IsSelected); }
+            set
+            {
+                if (_selectedItem == value) return;
+                if (_selectedItem != null)
+                {
+                    _selectedItem.IsSelected = false;
+                }
+
+                SetProperty(ref _selectedItem, (GroupVm)value);
+
+                if (_selectedItem != null)
+                {
+                    _selectedItem.IsSelected = true;
+                }
+            }
+        }
+
+        public SettingsDatabaseVm()
+        {
+            Groups = _app.Database.RootGroup.Groups;
+        }
+
+        // TODO: Move to another setting class (or a static class)
+        private T GetSetting<T>(string property)
+        {
+            try
+            {
+                return (T) Convert.ChangeType(_localSettings.Values[property], typeof(T));
+            }
+            catch (InvalidCastException)
+            {
+                return default(T);
+            }
+        }
+    }
+}