Options was implemented for Godot 3 in https://github.com/GodotModules/GodotModulesCSharp/tree/dev, it just needs be ported over now. Perhaps it needs to be done from scratch. I was playing around with dependency injection at the time and I'm not sure if I really liked it because it got really messy. (Make sure you are on the dev branch of Godot Modules when you clone it)
Options was implemented for Godot 3 in https://github.com/GodotModules/GodotModulesCSharp/tree/dev, it just needs be ported over now. Perhaps it needs to be done from scratch. I was playing around with dependency injection at the time and I'm not sure if I really liked it because it got really messy. (Make sure you are on the dev branch of Godot Modules when you clone it)