I am quite happy using VSCode for Zorro, and the auto-completion ("Intellisense"), function definition (F12) etc. all work out of the box (with C/C++ extension), no configuration or snippet definition needed. (No debugging, though, of course, because VSCode does not have a Lite-C runtime.) If you put "#include <default.c>" at the top of your file, VSCode will pick up all of the definitions.