Need to fix component supportedLayout

[taylortom]

In legacy code, supportedLayout is defined in the properties.schema, and determines which layouts are supported by a component, and is an array of strings:

"_supportedLayout": {
  "type": "string",
  "required": true,
  "enum": ["full-width", "half-width", "both"],
  "default": "both",
  "editorOnly": true
},

First thing: this value is set by the developer and never changed, so doesn't really make sense to be in the schema (maybe the bower.json or package.json?).

Second thing: as far as I can tell, this is only used in editorPageComponent view, and converted from the above array into an object with the format { full: true, half: true }. It seems more sensible to define it this way in the first place, as there's no need for the array format AFAIK.

[taylortom]

It was agreed that this should eventually go completely, but will be left for now for compatibility reasons