Construct:

	$default_args = array(
		'id'	=> 'awe-thumbnail',
		'title'	=> __( 'AWE Thumbnail Setting', 'hillter' ),
		'screen'	=> array( 'post' ),
		'context'	=> 'normal',
		'priority'	=> 'low',
		'fields'	=> array(),
	);

	new AWE_Thumbnail( $default_args );


Fields:
	'fields'	=> array(
		'field-id'	=> array(
			'type'	=> 'field-type',
			'title'	=> __( 'Field title', 'hillter' ),
		),
		'other-field-id'	=> array(
			'type'	=> 'field-type',
			'title'	=> __( 'Other Field title', 'hillter' ),
		),
	),


Meta key: {metabox id}-{field id}
Always have a meta key: {metabox id}-type


4 type: image, gallery, video, audio


Meta value
	Image type:
		string		image url

	Gallery type:
		array
			shortcode		string		gallery shortcode
			images			array		{image id} => {image url}

	Video type:
		array
			url				string		Video url
			embed			string		Embed url

	Audio type:
		array
			url				string		Soundcloud url
			autoplay		string		'true' | 'false'