Implemented a bunch of base message types with static instances store…

…d to avoid useless allocations and make code more fluent

Runtime/Messaging/Messages/BaseTagMessage.cs

@@ -0,0 +1,9 @@
+namespace MVVMToolkit.Messaging
+{
+    public abstract class BaseTagMessage<TType> where TType : new()
+    {
+        private static readonly TType Instance = new();
+
+        public static TType Message() => Instance;
+    }
+}

Runtime/Messaging/Messages/BaseValueMessage.cs

@@ -0,0 +1,7 @@
+namespace MVVMToolkit.Messaging
+{
+    public abstract class BaseValueMessage<TValue>
+    {
+        public TValue value;
+    }
+}

Runtime/Messaging/Messages/CloseViewsMessage.cs

@@ -1,4 +1,4 @@
 namespace MVVMToolkit.Messaging
 {
-    public class CloseViewsMessage { }
+    public class CloseViewsMessage : BaseTagMessage<CloseViewsMessage> { }
 }

Runtime/Messaging/Messages/ValueMessage.cs

@@ -0,0 +1,14 @@
+namespace MVVMToolkit.Messaging
+{
+    public abstract class ValueMessage<TType, TValue> : BaseValueMessage<TValue>
+        where TType : BaseValueMessage<TValue>, new()
+    {
+        private static readonly TType Instance = new();
+
+        public static TType Message(TValue value)
+        {
+            Instance.value = value;
+            return Instance;
+        }
+    }
+}