Add config options to hide parts of the eComma UI

Fixes https://edgeryders.eu/en/open-ethnographer/task-4118

Adds config form in admin/config/ecomma to en/disable all ecomma tabs
Blocks are disabled in ecomma_block_view, with the exception of the comment block.
Since that isn't generated in the ecomma module, we disable it in JS instead.