URI Support for server joining

[Eoin-ONeill-Yokai]

Browsing the srb2kart server browser, I was surprised when the direct link feature (the link icon next to the server IP on the details panel) didn't automatically associate with the SRB2Kart flatpak installation.

For example srb2kart://ip/some.cool.server:5029 should be able to find the application through Gnome Software or equivalent applications I believe. Instead I get the following window:

I'm not positive, but this should be able to be defined in the flatpak manifest file, right?