增加虚线Dash、点线Dot、点划线DashDot、双点划线DashDotDot等类型的折线图支持

Scripts/UI/Component/Axis.cs

@@ -69,13 +69,21 @@ namespace XCharts
             /// </summary>
             Solid,
             /// <summary>
-            /// 破折线
+            /// 虚线
             /// </summary>
             Dashed,
             /// <summary>
-            /// 虚线
+            /// 点线
             /// </summary>
-            Dotted
+            Dotted,
+            /// <summary>
+            /// 点划线
+            /// </summary>
+            DashDot,
+            /// <summary>
+            /// 双点划线
+            /// </summary>
+            DashDotDot
         }
 
         [SerializeField] protected bool m_Show = true;

Scripts/UI/Component/Serie.cs

@@ -92,7 +92,23 @@ namespace XCharts
         /// step line.
         /// 阶梯线图：下一个拐点。
         /// </summary>
-        StepEnd
+        StepEnd,
+        /// <summary>
+        /// 虚线
+        /// </summary>
+        Dash,
+        /// <summary>
+        /// 点线
+        /// </summary>
+        Dot,
+        /// <summary>
+        /// 点划线
+        /// </summary>
+        DashDot,
+        /// <summary>
+        /// 双点划线
+        /// </summary>
+        DashDotDot
     }
 
     /// <summary>