allow complementary features to be counted via ColumnCounterSetWorker

Groovy scripts such as https://www.jalview.org/examples/groovy/visibleFeaturesCounter.groovy do not include counts for complementary features, due to the ColumnCounterSetWorker not making appropriate calls to count complement features if they are enabled for the feature renderer.

This needs a patch along similar lines to JAL-3304. Without it, it is much more difficult to analyse feature distributions at scale in the context of genomic and protein annotation.