.arcconfig

templater: remove redundant member variables from templater class

We no longer need them since the engine is instantiated in __init__().

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