Setting NODE_LAYOUT_DIRECTION per node graph.

[LucaScheller]

Hey,
quick question about the vertical node graph node display style:
It seems like currently one can only set it globally by changing the NODE_LAYOUT_DIRECTION variable in the constants.py.
Are there plans to make this configurable per graph? (Are there reasons that it can't be configured per graph? If not, I could look into making a PR for this if you want.)

Thank you so much for creating this UI framework, it is very straight forward and easy to use!
Cheers,
Luca

[LucaScheller]

Created a PR here: #273

[jchanvfx]

Released v0.3.0 with a set_layout_direction() function

https://chantonic.com/NodeGraphQt/api/graph.html#NodeGraphQt.NodeGraph.set_layout_direction
https://chantonic.com/NodeGraphQt/api/nodes/NodeObject.html#NodeGraphQt.NodeObject.set_layout_direction

[LucaScheller]

Amazing :) Thank you very much!