origin-xtask 0.1.0

Origin maintenance tasks as a library, so a derivative's xtask is three lines and its rules arrive with a version bump.
Documentation 
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{
  "identifier": "default",
  "description": "Hand-written before app.toml existed.",
  "windows": ["main"],
  "permissions": ["core:default", "core:event:allow-listen", "core:event:allow-unlisten"]
}