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/epaint/Cargo.toml

@@ -57,6 +57,9 @@ extra_debug_asserts = [
 ## Always enable additional checks.
 extra_asserts = ["emath/extra_asserts", "ecolor/extra_asserts"]
 
+## Turn on the `log` feature, that makes egui log some errors using the [`log`](https://docs.rs/log) crate.
+log = ["dep:log"]
+
 ## [`mint`](https://docs.rs/mint) enables interoperability with other math libraries such as [`glam`](https://docs.rs/glam) and [`nalgebra`](https://docs.rs/nalgebra).
 mint = ["emath/mint"]
 
@@ -83,6 +86,8 @@ bytemuck = { version = "1.7.2", optional = true, features = ["derive"] }
 ## Enable this when generating docs.
 document-features = { version = "0.2", optional = true }
 
+log = { version = "0.4", optional = true, features = ["std"] }
+
 ## Allow serialization using [`serde`](https://docs.rs/serde) .
 serde = { version = "1", optional = true, features = ["derive", "rc"] }
 

crates/epaint/src/texture_atlas.rs

@@ -217,8 +217,8 @@ impl TextureAtlas {
         if required_height > self.max_height() {
             // This is a bad place to be - we need to start reusing space :/
 
-            #[cfg(feature = "tracing")]
-            tracing::wan!("epaint texture atlas overflowed!");
+            #[cfg(feature = "log")]
+            log::warn!("epaint texture atlas overflowed!");
 
             self.cursor = (0, self.image.height() / 3); // Restart a bit down - the top of the atlas has too many important things in it
             self.overflowed = true; // this will signal the user that we need to recreate the texture atlas next frame.