====== setBlockLightEx ======

  * Parameters and types:
    * x,y,z: numberposition
    * lv: numberlight intensity (0~16)
  * Return value and type:
     * code: numberSuccess (ErrorCode.OK) ErrorCode
  * The main function of this method: Set the light intensity
  * The specific use cases are as follows:

<code>
local code = World:setBlockLightEx(x, y, z, lv)
if code == ErrorCode.OK then
print('Execution successful', code )
else
print('Execution failed')
end
</code>