dynamic window parameters about scrum

[mkohlmyr]

doesnt appear to be a nice way of setting parent shell variables from node.

might have to perform the substitution ourselves.

if so we might aswell switch out $USER for {{process.env.user}} or similar

[mkohlmyr]

useful to maintain our own session configuration files? for restarting services defaulting to last used args and similar? probably not, but think it through

[mkohlmyr]

implemented as of c3cde9c using handlebars and portions of process and process.env as well as unclaimed arguments to scrum (all scrum arguments used by a command are deleted, those that remain are forwarded to handlebars as a property on the arg object)