Add and update multiple overlays for the appliance

All enums for the integer type fields are shown in the model description (excluding the brownout thresholds, they can be any valid number).
<br/ >The IDs of overlays must be unique from the overlays already stored on this appliance.

This will remove any overlays that are on the appliance but not included in the POST body. The overlay cannot be deleted if it's in use, if an overlay could not be deleted, the request will still be successful, but the overlay ID that could not be deleted will be included in the message