*: Use structured logging

Implements structured logging via Logrus. This gives us a logger per
boundry that we care about, allowing for easier parsing of logs if users
have more than one log option enabled. Also, cleans up a lot of
conditionals in the code by simply silencing the logger at creation as
opposed to conditionally logging everywhere.

pkg/terminal/command_test.go

@@ -113,7 +113,7 @@ func withTestTerminalBuildFlags(name string, t testing.TB, buildFlags test.Build
 		Listener:    listener,
 		ProcessArgs: []string{test.BuildFixture(name, buildFlags).Path},
 		Backend:     testBackend,
-	}, false)
+	})
 	if err := server.Run(); err != nil {
 		t.Fatal(err)
 	}