New color to brush converter

New boolean to visibility converter
Base class to handle property changes notifications for all View Models
Template selector to handle a different first item in listviews or gridviews

ModernKeePass/Common/NotifyPropertyChangedBase.cs

@@ -0,0 +1,28 @@
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Runtime.CompilerServices;
+
+namespace ModernKeePass.Common
+{
+    public class NotifyPropertyChangedBase : INotifyPropertyChanged
+    {
+        public event PropertyChangedEventHandler PropertyChanged;
+
+        protected void OnPropertyChanged([CallerMemberName] string propertyName = "")
+        {
+            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+        }
+
+        protected bool SetProperty<T>(ref T property, T value, [CallerMemberName] string propertyName = "")
+        {
+            if (EqualityComparer<T>.Default.Equals(property, value))
+            {
+                return false;
+            }
+
+            property = value;
+            OnPropertyChanged(propertyName);
+            return true;
+        }
+    }
+}

ModernKeePass/Common/ObservableDictionary.cs

@@ -46,6 +46,14 @@ namespace ModernKeePass.Common
             this.Add(item.Key, item.Value);
         }
 
+        public void AddRange(IEnumerable<KeyValuePair<string, object>> values)
+        {
+            foreach (var value in values)
+            {
+                Add(value);
+            }
+        }
+
         public bool Remove(string key)
         {
             if (this._dictionary.Remove(key))