Feature request: rearrange Global Environment Variables

As a flow designer, I want to rearrange Global Environment Variables using a gripper similar to the Inject node properties, to organize them logically and prevent them from becoming disorganized when creating new variables.

Thanks Simon.

Hi @evdheuvelUpl,

Sorry for the wait I had completely forgotten about it.

The list is supposed to be sortable but there is a bug that I just fixed.