## Issue
Closes 6159 "Support Comments Enabled/Disabled for comment.List API"
## New behavior
- `disable-comments` tag will block the comments component entirely.
- `settings.commentsEnabled`:
- When false, will pause comment fetching, posting and replying.
- Any already-fetched comments will stay on screen (unless user reloads/F5).
## Changes:
1) TagSearch: hide the "control tags" in the Creator Settings page (irrelevant).
2) TagSearch: show the "control tags" when creating/editing Channel (let's use `setting.CommentsEnabled` instead).
3) TagSearch: show the "control tags" when creating/editing Content (`disable-comments` can be used to block comments at the per-claim level, e.g. allow comments in general but block only for specific claims).
## Missing pieces:
For (2) and (3), some work is needed to hide the comment GUI when `setting.CommentsEnabled` is disabled for a particular channel. That flag is not ready in Commentron yet, so I'm not sure how this will be done at the moment. In other words, the checkbox does nothing at the moment.
## Potential flaw:
This change will hide all control tags. If we have more tags in the future and would like to selectively disable some, we'll have to change this parameter to an array instead. Since the usage is not widespread at the moment, a single `disableControlFlag` seems cleaner (don't over-think it yet).
