SVGHMI: widgets are not anymore binary relative or absolute, but have a "relativeness".

Because of allowing multiple variables per widget, we must distinguish if individual variables is relative to page, not the whole widget.

{
    "ID": "wamptest", 
    "active": true, 
    "protocolOptions": {
        "autoPingInterval": 60, 
        "autoPingTimeout": 20
    }, 
    "realm": "Automation", 
    "url": "ws://127.0.0.1:8888"
}