Improve node graph performance

[adamgerhant]

Move wire rendering into backend Implement culling for offscreen nodes Improves properties/document upgrade stability

Decreases frame time from 120ms -> 20ms when zoomed in on red dress node graph Increases frame time from 120 -> 200ms when fully zoomed out

Old: New:

Known issues: Direct wire paths not supported. Subpath rectangle_intersections_exist function is buggy, so dragging onto wire is still inconsistent