Split logger.h into log_reader and log_writer

Much simpler!

Change-Id: I6c4ee363b56b67dac40c456261bbed79d01b8eb6
diff --git a/frc971/analysis/BUILD b/frc971/analysis/BUILD
index 2901463..b72634a 100644
--- a/frc971/analysis/BUILD
+++ b/frc971/analysis/BUILD
@@ -23,7 +23,7 @@
         "//aos:json_to_flatbuffer",
         "//aos/events:shm_event_loop",
         "//aos/events:simulated_event_loop",
-        "//aos/events/logging:logger",
+        "//aos/events/logging:log_reader",
         "@com_github_google_glog//:glog",
         "@python_repo//:python3.7_lib",
     ],