.arcconfig

formatter: pass in template spec to templateformatter as argument

Prepare for the next patch, which will unify handling of the formatter
names and the template names.

{
    "conduit_uri": "https://phab.mercurial-scm.org/api",
    "repository.callsign": "HG",
    "arc.land.onto.default": "@",
    "base": "hg:.^"
}