refactor<*>: rewrite all codes...

src/Models/Object.cs

@@ -0,0 +1,21 @@
+namespace SourceGit.Models {
+    /// <summary>
+    ///     提交中元素类型
+    /// </summary>
+    public enum ObjectType {
+        None,
+        Blob,
+        Tree,
+        Tag,
+        Commit,
+    }
+
+    /// <summary>
+    ///     Git提交中的元素
+    /// </summary>
+    public class Object {
+        public string SHA { get; set; }
+        public ObjectType Type { get; set; }
+        public string Path { get; set; }
+    }
+}