Port node graph wires to the backend and improve graph UI performance (#2795)

* Improve node graph performance

* Fix wire bugs, add type default for properties.

* Grid aligned wire paths

* remove type source

* node from exposed input

* Refresh wires on preference change

* merge fixes

* Code review

* Fix names

* Code review

* Fix wires on redo/undo

---------

Co-authored-by: Keavon Chambers <keavon@keavon.com>

node-graph/gcore/src/vector/click_target.rs

@@ -67,6 +67,10 @@ impl ClickTarget {
 		self.bounding_box
 	}
 
+	pub fn bounding_box_center(&self) -> Option<DVec2> {
+		self.bounding_box.map(|bbox| bbox[0] + (bbox[1] - bbox[0]) / 2.)
+	}
+
 	pub fn bounding_box_with_transform(&self, transform: DAffine2) -> Option<[DVec2; 2]> {
 		self.bounding_box.map(|[a, b]| [transform.transform_point2(a), transform.transform_point2(b)])
 	}