Add utility script to generate Wiki table of filters
SimpleITK cd897256 Filter descriptions (reduced)

This tree was extracted from upstream SimpleITK by the following shell script:
  ./Utilities/UpdateFilterDescriptionsFromSimpleITK.sh
Merge branch 'sitk-upstream' into update-sitk
Removing Filters which produce labelmaps as outputs
Fix json syntax issue StatisticsImageFilter
Update help and acknowledgment text
Remove statistics only filters

These filters don't produce image outputs, they only produce
statistics.