A configurable version of the vanilla GenLayerRemoveTooMuchOcean. Removes "excess" 
ocean biomes.



Constructor:
    Arguments:
        long, GenLayer
    Argument Usage:
        base layer seed, parent layer
    Notes:
        Constructs the layer with its base seed and parent layer.

setOceanSize:
    Arguments:
        String
    Usage:
        ocean size
    Notes:
        Sets the ocean size for the layer. Options are "Small", "Large", "Default". Small replaces all ocean with plains, large does nothing, default does vanilla removal behavior.