Setup rustfmt for everything and address cargo clippy.

rtiow/tracer/rustfmt.toml

@@ -0,0 +1,2 @@
+imports_granularity = "Crate"
+format_code_in_doc_comments = true

rtiow/tracer/src/main.rs

@@ -4,7 +4,6 @@ use std::fs;
 #[cfg(feature = "profile")]
 use cpuprofiler::PROFILER;
 use log::info;
-use stderrlog;
 use structopt::StructOpt;
 
 use renderer::renderer::render;