Opening Databases now use a Messenger service

WinAppCommon/Messages/DatabaseAlreadyOpenedMessage.cs

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+using ModernKeePass.Application.Database.Models;
+
+namespace Messages
+{
+    public class DatabaseAlreadyOpenedMessage
+    {
+        public DatabaseVm OpenedDatabase { get; set; }
+    }
+}

WinAppCommon/Messages/DatabaseClosedMessage.cs

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+namespace Messages
+{
+    public class DatabaseClosedMessage
+    {
+        
+    }
+}

WinAppCommon/Messages/DatabaseOpenedMessage.cs

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+namespace Messages
+{
+    public class DatabaseOpenedMessage
+    {
+        public string RootGroupId { get; set; }
+    }
+}

WinAppCommon/Messages/DatabaseOpeningMessage.cs

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+namespace Messages
+{
+    public class DatabaseOpeningMessage
+    {
+        public string Token { get; set; }
+    }
+}

WinAppCommon/Messages/NavigateToPageMessage.cs

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+namespace Messages
+{
+    public class NavigateToPageMessage
+    {
+        public string Destination { get; set; }
+        public object Parameter { get; set; }
+    }
+}

WinAppCommon/Messages/SaveErrorMessage.cs

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+namespace Messages
+{
+    public class SaveErrorMessage
+    {
+        
+    }
+}