sequential is one of the feature types provided by CoFH
World. It generates multiple features at the same location, one
after the other.
When using this feature type, the following value must be added to the feature type configuration.
||Array of feature type configurations and/or arrays of feature type configurations||-||The features to generate in sequence. Each item in the array is either a feature type configuration or an array of them. When specified as an array, a feature type configuration is selected randomly each time the feature is generated.|