====== showShape ======

  * Parameters & Types:
     * shapeid:number
      * showflag:boolean
  * Return value and type:
     * ErrorCode. OK
  * The main purpose of this method is to set the shape to show or hide
  * Specific use cases are as follows:
<code>
--Hide the shape with id 1
--The first parameter is the shape id
--The second parameter is whether to hide, true to show and false to hide
MapMark:showShape(1,false)
--Show in the chat box
Chat:sendSystemMsg("Hide the shape with id 1!")
</code>