批量圖形操作，合併Undo 原

因爲有好幾個同學問到如何將多個圖形操作步驟合併成一個Undo，所以就增加了比較實用的 combineRegen 函數。

• iOS 應用例(GiViewHelper *hlp)

   [hlp combineRegen:^{
       hlp.command = @"line{'points':[10,10, 20,20, 20,10, 30,20]}";
       hlp.command = @"lines{'points':[10,10, 20,20, 20,10, 30,20]}";
   }];
  

• Android 應用例(IViewHelper hlp)

   hlp.combineRegen(new Runnable() {
       @Override
       public void run() {
           hlp.setCommand("line{'points':[10,10, 20,20, 20,10, 30,20]}");
           hlp.setCommand("lines{'points':[10,10, 20,20, 20,10, 30,20]}");
       }
   });
  

• C# 應用例(WPFViewHelper hlp)

   hlp.CombineRegen(delegate()
   {
       hlp.Command = "line{'points':[10,10, 20,20, 20,10, 30,20]}";
       hlp.Command = "lines{'points':[10,10, 20,20, 20,10, 30,20]}";
   });