code: public static <T> T importProperty(MutableExtension extension, String propertySuffix)
      {
          return extension.removeProperty(Extension.IKEYPREFIX + propertySuffix);
      }
docs: Delete and return the value of the passed special property.
  
  @param <T> type of the property value
  @param extension the extension from which to extract custom property
  @param propertySuffix the property suffix
  @return the value
  @ @since 8.3M1