Gets the class from Blockly options for the given type. This is used for plugins that override a built in feature. (e.g. Toolbox)
The type of the plugin.
The option object to check for the given plugin.
Optional
Whether or not to throw an error if we are unable to find the plugin.
The class for the plugin.
Gets the class from Blockly options for the given type. This is used for plugins that override a built in feature. (e.g. Toolbox)