Replace tracing with log (#2928)

* Replace tracing crate with log

It's just so much simpler to use

* Add `bacon wasm` job

* eframe: add a WebLogger for piping log events to the web console

crates/egui_demo_app/src/lib.rs

@@ -52,7 +52,7 @@ pub fn init_wasm_hooks() {
     console_error_panic_hook::set_once();
 
     // Redirect tracing to console.log and friends:
-    tracing_wasm::set_as_global_default();
+    eframe::web::WebLogger::init(log::LevelFilter::Debug).ok();
 }
 
 #[cfg(target_arch = "wasm32")]