Remove ANSI color codes from tmux logs

We have been using a tmux plugin to capture session logs.

Sometimes, especially when using zsh, logs contain ANSI color codes and cursor movement codes.

To strip them (although not all of them):

perl -pe 's/\x1b\[[0-9;]*[a-zA-Z]//g' tmux.log > tmux-clean.log

Better yet, one can also use ansifilter.