This fixes #152, in that it allows "collapsed stacks" files generated with tools using Windows line endings to be imported into the tool verbatim.
This makes the left-heavy view much more useful since recursive calls are all collapsed together. Press `r` to activate Fixes #37
This should help keep things organized as speedscope supports more languages & more formats Test Plan: Try importing from every single file type, see that the link to load the example profile still works