Rename the nodes 'Length' -> 'Magnitude', 'Flatten Path' -> 'Combine Paths', 'Vec2 Value' -> 'Combine Vec2', and add a new 'Vec2 Value' node (#4349)

* Rename the node 'Length' -> 'Magnitude'

* Rename the node 'Flatten Path' -> 'Combine Paths'

* Replace the node 'Vec2 Value' with 'Combine Vec2' and add a new 'Vec2 Value' that's actually a vec2

* Update demo artwork

node-graph/nodes/gcore/src/extract_xy.rs

@@ -5,7 +5,7 @@ use glam::{DVec2, IVec2, UVec2};
 
 /// Obtains the X or Y component of a vec2.
 ///
-/// The inverse of this node is "Vec2 Value", which can have either or both its X and Y parameters exposed as graph inputs.
+/// The inverse of this node is **Combine Vec2**, which composes a vec2 from its X and Y components.
 #[node_macro::node(name("Extract XY"), category("Math: Vector"))]
 fn extract_xy<T: Into<DVec2>>(_: impl Ctx, #[implementations(DVec2, IVec2, UVec2)] vector: Item<T>, axis: Item<XY>) -> Item<f64> {
 	let vector = vector.into_element();