Change name to refect increased scope, will try to run whole gn process

Since I'm not intending to support 88 or 108, I just use the 126 tag
DEPs from src/headless/app as a template. But if you wanted to try and
build these, you'd retrieve the DEPS file from the same directory but at
the right git checkout.

All version folders must be the version purely, no suffix or prefix.
All bash variabels quoted where they need to.
--try and -t will now allow you to default back to the latest version of
a bash script.

rsync helps prevent rebuilds