4987 - support `browse_trace` tool in SubX

I've extracted it into a separate binary, independent of my Mu prototype.

I also cleaned up my tracing layer to be a little nicer. Major improvements:

- Realized that incremental tracing really ought to be the default.
  And to minimize printing traces to screen.

- Finally figured out how to combine layers and call stack frames in a
  single dimension of depth. The answer: optimize for the experience of
  `browse_trace`. Instructions occupy a range of depths based on their call
  stack frame, and minor details of an instruction lie one level deeper
  in each case.

Other than that, I spent some time adjusting levels everywhere to make
`browse_trace` useful.

1 files changed, 6 insertions, 0 deletions

diff --git a/browse_trace/clean b/browse_trace/clean
new file mode 100755
index 00000000..69b30478
--- /dev/null
+++ b/browse_trace/clean
@@ -0,0 +1,6 @@
+#!/bin/sh
+set -e
+
+set -v
+rm -rf browse_trace_bin* *_list
+rm -rf termbox/*.o termbox/libtermbox.a