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Triggered in: Cms\Classes\Theme.php

Extend form field configuration supplied by the theme by returning an array.

Note if you are planning on using assetVar to inject CSS variables from a plugin registration file, make sure the plugin has elevated permissions.

Example usage:

Event::listen('cms.theme.extendFormConfig', function ($themeCode, &$config) {
     array_set($config, 'tabs.fields.header_color', [
         'label'           => 'Header Colour',
         'type'            => 'colorpicker',
         'availableColors' => [#34495e, #708598, #3498db],
         'assetVar'        => 'header-bg',
         'tab'             => 'Global'

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