Made a new material IO plugin because the old one wasn't working. The new material IO plugin uses JSON instead of a custom
resource because you currently cannot save custom resources from GDScript.
Not all APIs are provided yet, please request whathever you are missing.
Some example plugins are provided in demos/plugins. Just copy them to a folder in your project named addons/ and then enable them from the project settings.
Have fun!
Aaron Franke
Hugo Locurcio
Rémi Verschelde
TwistedTwigleg
Juan Linietsky