Wordpress plugin doesn't support multiple assets on a page

[cmcfadden]

With Gutenberg, the Wordpress plugin won't support multiple assets on the same page properly. This is because the message listener stays live for all of the active plugin instances.

To resolve, we'll need to create some sort of UUID for each instance of the plugin, and pass that over the inter window messaging. Then we'll need to pass it back from Elevator and ensure we only respond to the right one.