(core) Comments

Summary:
First iteration for comments system for Grist.
- Comments are stored in a generic metatable `_grist_Cells`
- Each comment is connected to a particular cell (hence the generic name of the table)
- Access level works naturally for records stored in this table
-- User can add/read comments for cells he can see
-- User can't update/remove comments that he doesn't own, but he can delete them by removing cells (rows/columns)
-- Anonymous users can't see comments at all.
- Each comment can have replies (but replies can't have more replies)

Comments are hidden by default, they can be enabled by COMMENTS=true env variable.
Some things for follow-up
- Avatars, currently the user's profile image is not shown or retrieved from the server
- Virtual rendering for comments list in creator panel. Currently, there is a limit of 200 comments.

Test Plan: New and existing tests

Reviewers: georgegevoian, paulfitz

Reviewed By: georgegevoian

Subscribers: paulfitz

Differential Revision: https://phab.getgrist.com/D3509

static/icons/icons.css

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+  --icon-Message: url('data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iMTYiIGhlaWdodD0iMTYiIGZpbGw9Im5vbmUiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyI+PHBhdGggZD0iTTE1LjUgN0MxNS41IDMuNDEgMTIuMTQyIDAuNSA4IDAuNUMzLjg1OCAwLjUgMC41IDMuNDEgMC41IDdDMC41IDEwLjU5IDMuODU4IDEzLjUgOCAxMy41QzguNTI1IDEzLjUgOS4wMzcgMTMuNDUyIDkuNTMyIDEzLjM2M0wxMy41IDE1LjVWMTEuNDA5QzE0LjczOCAxMC4yNSAxNS41IDguNzA0IDE1LjUgN1oiIHN0cm9rZT0iIzkyOTI5OSIgc3Ryb2tlLW1pdGVybGltaXQ9IjEwIiBzdHJva2UtbGluZWNhcD0icm91bmQiIHN0cm9rZS1saW5lam9pbj0icm91bmQiLz48L3N2Zz4=');
   --icon-Minus: url('data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iMTYiIGhlaWdodD0iMTYiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyI+PHJlY3QgZmlsbD0iIzAwMCIgZmlsbC1ydWxlPSJub256ZXJvIiB4PSIyIiB5PSI3LjUiIHdpZHRoPSIxMiIgaGVpZ2h0PSIxIiByeD0iLjUiLz48L3N2Zz4=');
   --icon-MobileChat: url('data:image/svg+xml;base64,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');
   --icon-MobileChat2: url('data:image/svg+xml;base64,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');
@@ -91,6 +93,7 @@
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   --icon-PivotLight: url('data:image/svg+xml;base64,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');
   --icon-Plus: url('data:image/svg+xml;base64,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');
+  --icon-Popup: url('data:image/svg+xml;base64,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');
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static/ui-icons/UI/Chat.svg

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static/ui-icons/UI/Message.svg

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static/ui-icons/UI/Popup.svg

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