Recently, I've been playing with VS Code as an IDE for Stars in Shadow development. Some Korean game devs have written a very nice Lua debugger for it, and that means VS Code is now actually in many cases a better IDE for SiS than Visual Studio. It's also far easier to download and setup. If you're a modder, I'd suggest taking a look.
As of r37523 (which is currently "live" on Steam/GoG) you should be able to get setup as follows:
Install VS Code
From your VS Code extensions tab, install the devCAT Lua Debugger.
From your VS Code extensions tab, Install sven2718's openhintvc extension.
Go to File->Open Folder and open your "Lua state" dir.
In the VS Code debug pane, select launch-sis, and hit the green arrow.
Now, if everything is working, the game should start in debug mode, and you should have access to both CTRL+click hotkeys and the ability to set breakpoints / view stack traces.