* Update page object of change node
* Support multiple node outputs in UI testing
* Add page object of switch node
* Add page objects of trigger and exec nodes
* Remove unnecessary code
* Update page object of trigger node to select time unit
* Add page objects of websocket nodes
* Support boolean as value in selectWithWait()
* Update page object of split node
* Merge page objects of mqtt nodes to make them same as original mqtt node file path