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

examples/keyboard_events/src/main.rs

@@ -4,8 +4,8 @@ use eframe::egui;
 use egui::*;
 
 fn main() -> Result<(), eframe::Error> {
-    // Log to stdout (if you run with `RUST_LOG=debug`).
-    tracing_subscriber::fmt::init();
+    // Log to stderr (if you run with `RUST_LOG=debug`).
+    env_logger::init();
 
     let options = eframe::NativeOptions::default();
     eframe::run_native(