centralized printf formats and improved log_displayer performance

Before, log_displayer copied each message into the same structure that
gets put into queues etc so that it could be printed with the same
function. Now, it prints it directly, but using the same formats.
diff --git a/aos/build/queues/print_field.rb b/aos/build/queues/print_field.rb
index 2e70e15..c7b8530 100644
--- a/aos/build/queues/print_field.rb
+++ b/aos/build/queues/print_field.rb
@@ -17,6 +17,7 @@
 #include "aos/common/byteorder.h"
 #include "aos/common/time.h"
 #include "aos/common/print_field_helpers.h"
+#include "aos/common/logging/logging_printf_formats.h"
 
 namespace aos {