feature<Welcome>: add sort supports

src/Models/Preference.cs

@@ -18,6 +18,15 @@ namespace SourceGit.Models {
             "preference_v4.json");
         private static Preference instance = null;
 
+        /// <summary>
+        ///     起始页仓库列表排序方式
+        /// </summary>
+        public enum SortMethod {
+            ByNameASC,
+            ByNameDESC,
+            ByRecentlyOpened,
+        }
+
         /// <summary>
         ///     通用配置
         /// </summary>
@@ -68,6 +77,11 @@ namespace SourceGit.Models {
             ///     上一次检测的时间（用于控制每天仅第一次启动软件时，检测）
             /// </summary>
             public int LastCheckDay { get; set; } = 0;
+
+            /// <summary>
+            ///     起始页仓库列表排序规则
+            /// </summary>
+            public SortMethod SortBy { get; set; } = SortMethod.ByNameASC;
         }
 
         /// <summary>

src/Models/Repository.cs

@@ -28,6 +28,7 @@ namespace SourceGit.Models {
         public string Path { get; set; } = "";
         public string GitDir { get; set; } = "";
         public int Bookmark { get; set; } = 0;
+        public long LastOpenTime { get; set; } = 0;
         public List<SubTree> SubTrees { get; set; } = new List<SubTree>();
         public List<string> Filters { get; set; } = new List<string>();
         public List<string> CommitMessages { get; set; } = new List<string>();

src/Models/Watcher.cs

@@ -56,6 +56,7 @@ namespace SourceGit.Models {
             var watcher = new Watcher();
             watcher.Start(repo.Path, repo.GitDir);
             all.Add(repo.Path, watcher);
+            repo.LastOpenTime = DateTime.Now.ToFileTime();
 
             Opened?.Invoke(repo);
         }