Switch magic timestamp channel to RemoteMessage

In order to track reboots and such, we really need to communicate more
information from the message_bridge to the logger.  It is a shame to
have to modify the MessageHeader to do this, even though it would be
nice.  Switch the remote timestamp channels over to a new RemoteMessage
channel instead, and add code to rename the channel when replaying.

There are no known log files with a MessageHeader actually logged, so
most of this should be pretty safe.  I've tested this on an old log file
by hand.

Change-Id: If81b31869b95040151d833d20ec3eb8623ab1cd4
diff --git a/y2020/BUILD b/y2020/BUILD
index e54c168..a759681 100644
--- a/y2020/BUILD
+++ b/y2020/BUILD
@@ -172,7 +172,7 @@
             "//y2020/vision/sift:sift_fbs",
             "//y2020/vision/sift:sift_training_fbs",
             "//y2020/vision:vision_fbs",
-            "//aos/events/logging:logger_fbs",
+            "//aos/network:remote_message_fbs",
         ],
         target_compatible_with = ["@platforms//os:linux"],
         visibility = ["//visibility:public"],
@@ -200,7 +200,7 @@
         "//y2020/vision/sift:sift_fbs",
         "//y2020/vision/sift:sift_training_fbs",
         "//y2020/vision:vision_fbs",
-        "//aos/events/logging:logger_fbs",
+        "//aos/network:remote_message_fbs",
     ],
     target_compatible_with = ["@platforms//os:linux"],
     visibility = ["//visibility:public"],
@@ -216,7 +216,7 @@
     src = "y2020_roborio.json",
     flatbuffers = [
         ":setpoint_fbs",
-        "//aos/events/logging:logger_fbs",
+        "//aos/network:remote_message_fbs",
         "//aos/network:message_bridge_client_fbs",
         "//aos/network:message_bridge_server_fbs",
         "//aos/network:timestamp_fbs",