Added by-name instantiation.

Diffs=
6488a1822 Added by-name instantiation. (#6102)

Co-authored-by: Dragoș Tiselice <dragos@rive.app>

.rive_head

diff --git a/.rive_head b/.rive_head
index 9efff06..20a4fcf 100644
--- a/.rive_head
+++ b/.rive_head
@@ -1 +1 @@
-7bc216b036bff5ec296f5dc14787b4779c18c871
+6488a182262d4a9307567c58b9f20712668d462f

vello/src/main.rs

diff --git a/vello/src/main.rs b/vello/src/main.rs
index 9bb6c32..4067004 100644
--- a/vello/src/main.rs
+++ b/vello/src/main.rs
@@ -1,6 +1,6 @@
 use std::{fs, time::Instant};
 
-use rive_rs::{Artboard, File, Instantiate, Viewport};
+use rive_rs::{Artboard, File, Handle, Instantiate, Viewport};
 use vello::{
     kurbo::{Affine, Rect, Vec2},
     peniko::{Color, Fill},
@@ -89,9 +89,9 @@
                 WindowEvent::DroppedFile(path) => {
                     scene = Some({
                         let file = File::new(&fs::read(path).unwrap()).unwrap();
-                        let artboard = Artboard::instantiate(&file, None).unwrap();
+                        let artboard = Artboard::instantiate(&file, Handle::Default).unwrap();
 
-                        Box::<dyn rive_rs::Scene>::instantiate(&artboard, None).unwrap()
+                        Box::<dyn rive_rs::Scene>::instantiate(&artboard, Handle::Default).unwrap()
                     });
                 }
                 _ => {}