!205 右键菜单加入取消选中功能 ，像esc

Merge pull request !205 from 肖诗雅/rightmenu_esc

src/Editor/InitRightMenu.ts

@@ -63,6 +63,7 @@ export async function InitRightMenu(type?: RightMenuType, kwlist?: KeyWord[], ne
         if (type === RightMenuType.Selected)
         {
             RightMenu.push(...[
+                { key: "ESC", msg: `取消选中` },
                 { key: "DEL", msg: `删除` },
                 { key: "M", msg: `移动` },
                 { key: "O", msg: `旋转` },

src/Editor/MouseControls.ts

@@ -54,6 +54,9 @@ export class MouseControls
                 if (lastCmd)
                     commandMachine.ExecCommand(lastCmd);
                 break;
+            case "ESC":
+                this.m_Ed.m_SelectCtrl.Cancel();
+                break;
             case "C"://复制
 
                 if (res.Parent === "最近的输入")