[PATCH] Open local url using the os instead of the browser

[Emvee]

I have a local python script that listens on a port and accepts a URL like

​http://127.0.0.1:8282/qgis_zoom_to?lat=51.5810865&lon=4.5293149

I did put that in the custom URL configuration of the Utilsplugins2 settings as:

​http://127.0.0.1:8282/qgis_zoom_to?lat={#lat}&lon={#lon}

And that will open the browser after which the browser will call the local script.
While this is working it has the drawback that it leaves an empty tab open every time you involve this script and this extra browser step adds latency

What this patch does is to check for a local address and if so, open the url using the Java system functionality. This way I see the script is called without involving the browser.

With the current patch, josm will emit a warning if the local system is not handling the request:

2024-05-22 10:25:42.538 SEVERE: Can not open URL ​http://127.0.0.1:8282/qgis_zoom_to?lat=51.5810865&lon=4.5293149: java.net.ConnectException: Connection refused