Persist Editor/Project Settings

[bshore]

Is your feature request related to a problem? Please describe. Editor should save some common high-level information.

• 2D / 3D Camera mode
• Most recent stage or default (LaunchParams.StartStage)
• Editor window size, monitor placement (~fancy)

Describe the solution you'd like

// settings.json
{
  "RecentProjects": {
    "/foo/bar/baz": {
      "CameraMode":"2D/3D",
      "Stage":"{stage-identifier}"
    },
  },
  "EditorWindow": {
      "Width":944,
      "Height":500,
      "Monitor": "Default/Dell/ViewSonic/etc..??"
  }
}

Describe alternatives you've considered N/A

Additional context N/A