Allow window_swallow_criteria to be mapped using window property filters just like window_command_mappings

[JonnyHaystack]

Configuration like the following would be useful for reasons explained in #92

{
  ...
  "window_swallow_criteria": {
    {
      "class": "^Alacritty$",
      "title": "nvim",
      "swallows": ["class", "instance"]
    }
  }
  ...
}