make log_displayer following faster on large files

It can now skip to close to the end of a log file without missing any
struct types. This means following old log files with a new
log_displayer won't work, but that's not very useful anyways...

Change-Id: I8ed78ce0bd0e1d7f28b6e98284490ea9b5a43f1e
4 files changed
tree: a894961e5cf87becd8323c867146589fc1958e6a
  1. aos/
  2. doc/
  3. frc971/
  4. output/
  5. vision/
  6. .clang-format
  7. .gitignore
  8. README.txt