Add more puffin profile scopes to eframe (#3330)

* Add puffin profile scopes to the startup and running of eframe

* puffin_profiler example: start puffin right away

* cargo format let-else statements

* More profile scopes

* Add some `#[inline]`

* Standardize puffin profile scope definitions

* standardize again

* Silence warning when puffin is disabled

examples/puffin_profiler/src/main.rs

@@ -56,6 +56,12 @@ fn start_puffin_server() {
         Ok(puffin_server) => {
             eprintln!("Run:  cargo install puffin_viewer && puffin_viewer --url 127.0.0.1:8585");
 
+            std::process::Command::new("puffin_viewer")
+                .arg("--url")
+                .arg("127.0.0.1:8585")
+                .spawn()
+                .ok();
+
             // We can store the server if we want, but in this case we just want
             // it to keep running. Dropping it closes the server, so let's not drop it!
             #[allow(clippy::mem_forget)]