message: Add BellSound to the schema
  Closes
diff: }
  ]
  },
  + "BellSound": {
  + "default": "",
  + "description": "Sets the file location of the sound played when the application emits a BEL character. If the path is invalid no sound will be played. This property also accepts an array of sounds and the terminal will pick one at random.",
  + "oneOf": [
  + {
  + "type": [
  + "string",
  + "null"
  + ]
  + },
  + {
  + "type": "array",
  + "items": {
  + "type": "string"
  + }
  + }
  + ]
  + },
  "AppearanceConfig": {
  "properties": {
  "colorScheme": {
  