SVGHMI: changes that should fix some corner cases about unlinking and discardable element that still didn't show until now.
- list that would have been declared in some groups could have been discarded.
- elements to be unlinked were comuted based on filtering $hmi_elements, whereas $hmi_widget already filtered list
{
"ID": "wamptest",
"active": true,
"protocolOptions": {
"autoPingInterval": 60,
"autoPingTimeout": 20
},
"realm": "Automation",
"url": "ws://127.0.0.1:8888"
}