Port try macro to new ? operator. (#3962)

* initial untry sweep

* restore try in ipc codegen, fix inference

* change a few missed try instances

logger/src/lib.rs

@@ -86,10 +86,9 @@ pub fn setup_log(config: &Config) -> Result<Arc<RotatingLogger>, String> {
 	let mut open_options = fs::OpenOptions::new();
 
 	let maybe_file = match config.file.as_ref() {
-		Some(f) => Some(try!(open_options
+		Some(f) => Some(open_options
 			.append(true).create(true).open(f)
-			.map_err(|_| format!("Cannot write to log file given: {}", f))
-		)),
+			.map_err(|_| format!("Cannot write to log file given: {}", f))?),
 		None => None,
 	};