Add user notes on accounts (#14148)

* Add UserNote model

* Add UI for user notes

* Put comment in relationships entity

* Add API to create user notes

* Copy user notes to new account when receiving a Move activity

* Address some of the review remarks

* Replace modal by inline edition

* Please CodeClimate

* Button design changes

* Change design again

* Cancel note edition when pressing Escape

* Fixes

* Tweak design again

* Move “Add note” item, and allow users to add notes to themselves

* Rename UserNote into AccountNote, rename “comment” Relationship attribute to “note”

app/javascript/mastodon/features/account_timeline/containers/header_container.js

@@ -19,6 +19,7 @@ import { initBlockModal } from '../../../actions/blocks';
 import { initReport } from '../../../actions/reports';
 import { openModal } from '../../../actions/modal';
 import { blockDomain, unblockDomain } from '../../../actions/domain_blocks';
+import { initEditAccountNote } from 'mastodon/actions/account_notes';
 import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
 import { unfollowModal } from '../../../initial_state';
 import { List as ImmutableList } from 'immutable';
@@ -102,6 +103,10 @@ const mapDispatchToProps = (dispatch, { intl }) => ({
     }
   },
 
+  onEditAccountNote (account) {
+    dispatch(initEditAccountNote(account));
+  },
+
   onBlockDomain (domain) {
     dispatch(openModal('CONFIRM', {
       message: <FormattedMessage id='confirmations.domain_block.message' defaultMessage='Are you really, really sure you want to block the entire {domain}? In most cases a few targeted blocks or mutes are sufficient and preferable. You will not see content from that domain in any public timelines or your notifications. Your followers from that domain will be removed.' values={{ domain: <strong>{domain}</strong> }} />,