D tooling: Gnome builder

[aberba]

Someone built a plug-in for Gnome builder last yr based on the d 
language server...back when it was still maintained.

https://github.com/d-language-server/gnome-builder-dlang

Gnome builder is to Linux what Visual Studio is to Windows.

The plug-in system is very well documented too.

https://builder.readthedocs.io/en/latest/plugins/creating.html


So two things to figure out now:
1) does d language server still work? Its stated in on the repo 
that its no longer maintained and that we should use code-d by 
WebFreak

2) figuring out and adapting it for code-d. Not sure how 
different code-d is from that d language server (DLS)