drop down list.

AvailableDevice represents an available device the plugin may be able to register.

ConfigKV represents a set key-value configuration, used in communicating to the plugin the current configuration.

This is the implementation of plugin.Plugin.

IgluRPC is what the server is using to communicate to the plugin over RPC.

IgluRPCServer is the RPC server which IgluRPC talks to.

PluginConfig represents a plugin's configuration key-value item constraints including title and description.

PluginManifest is used to describe the plugin's id, name, author, version, etc.

WebExtension represents an addon to the web page.

Iglu is the interface that we're exposing as a plugin.

ExtensionType specifies the type of web extension.