When the move from tmux I can no longer use pf to start processes from a
Procfile in a new session. This will do basically the same if we are not in a
tmux session and start all the processes in wezterm tabs in the same workspace.
This currently does not support closing the tabs, if this needs to be done you
can kill the hole terminal and start it again.
This also updates the script so you can pass in a file and it will use that
file. Previously it was hardcoded to `Procfile.dev`, now this is the default
however, can be overridden
Ade Attwood
7603040373