Added DialogHost as dialog system.

Implemented create folder and progrart image in menu in file explorer.

Progrart.Core/ProjectSystem/Project.cs

@@ -7,11 +7,18 @@ namespace Progrart.Core.ProjectSystem
 	[Serializable]
 	public class Project
 	{
+		public List<BuildConfiguration> Configurations = new List<BuildConfiguration>();
 	}
 	[Serializable]
 	public class BuildConfiguration
 	{
 		public string? Name;
-
+		public List<BuildItem> Items = new List<BuildItem>();
+	}
+	[Serializable]
+	public class BuildItem
+	{
+		public string? Source;
+		public string? Target;
 	}
 }