Add config options to hide parts of the eComma UI

Merged, and sorry for not using it

Merged the pull request now. Dropping eComma as a base software (reasons here now) unfortunately means Open Ethnographer will not use this code. You could offer it to the original eComma though.

All that doesn’t affect your payment of course :slight_smile: Thanks for the work, and you seem to get around pretty well in the Drupal API already.