render: remove getters from Surface, reimplement buffer sharing with Send+Sync

src/main.rs

@@ -19,6 +19,10 @@ fn main() {
 
     log::info!("Board: {}", core::any::type_name_of_val(&board));
 
+    log::info!("Creating tasks");
+    let mut system = board.system_tasks();
+    log::info!("System scheduler: {}", core::any::type_name_of_val(&system));
+
     let output = board.output();
     log::info!("Output: {}", core::any::type_name_of_val(&output));