Add panel_send_message script API

crates/script/src/api/mod.rs

@@ -94,6 +94,10 @@ impl Panel {
 
         self.draw_indexed(&vertices, &indices);
     }
+
+    pub fn send_message(&self, message: &[u8]) {
+        unsafe { panel_send_message(self.0, message.as_ptr() as u32, message.len() as u32) }
+    }
 }
 
 #[repr(transparent)]
@@ -443,4 +447,6 @@ extern "C" {
 
     fn message_get_len(id: u32) -> u32;
     fn message_get_data(id: u32, ptr: u32);
+
+    fn panel_send_message(id: u32, message_ptr: u32, message_len: u32);
 }