Grouping multiple devices as one device (enh)

[lokonli]

See:
https://www.domoticz.com/forum/viewtopic.php?p=309259#p309259

I saw this feature in old android app called ImperiHome
This is perfect solution for motion sensors od door/window contact sensor
How this works?
There is simple block of one device that have defined 1 or more devices behind and show active when any of this defined is active and show last active date of the newest active devices and when click showup popup with all defined devices.