Although layout facets are most likely to be represented in json, they can also be loaded from a properties file. Internally the json is converted to a bunch of properties, and it is the properties that are parsed and used to create facets.
Since this stuff was originally done for the memberOrder and memberOrderLayout facets, the properties file syntax is currently:
This ticket is to invert this ordering, in preparation for other facets being added, and to distinguish member-level facets from class-level facets.
The format of the JSON file is unchanged.