增加双击中键缩放到全部的特性.

dist/CameraControls.d.ts

@@ -31,6 +31,7 @@ export declare class CameraControls {
     onTouchEnd: (event: TouchEvent) => void;
     onTouchMove: (event: TouchEvent) => void;
     beginRotate(): void;
+    lastMiddleClickTime: number;
     onMouseDown: (event: MouseEvent) => void;
     onMouseUp: (event: MouseEvent) => void;
     onMouseMove: (event: MouseEvent) => void;