cli/sed: Very basic stream editing of traces.

Extremely limited, but have to start from somewhere.
diff --git a/cli/cli_main.cpp b/cli/cli_main.cpp
index d6db619..1e278e4 100644
--- a/cli/cli_main.cpp
+++ b/cli/cli_main.cpp
@@ -72,6 +72,7 @@
     &dump_command,
     &dump_images_command,
     &pickle_command,
+    &sed_command,
     &repack_command,
     &retrace_command,
     &trace_command,