Graph Editor Connections aren't antialiased
Godot version:
3.0.2 Stable
OS/device including version:
Ubuntu 16.04
Issue description:
The GraphEdit connections are not smoothed out:
![image](data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==)
While they are in the VS editor:
![image](data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==)
Steps to reproduce:
Set up a Graph Edit, add some nodes and connect them.