Some demo messages have a grey background because they have the subtype_id set to
NULL.
The subtype should be `mail.mt_comment`, like other messages inside the general channel.

task-2278438

closes odoo/odoo#54261

X-original-commit: 9be1079cc62699d119b9c2acc6282bd72f71f9af
Signed-off-by: Sébastien Theys (seb) <seb@odoo.com>

Before this commit, when starting a new database with demo data,
the default channel `#general` had no messages initially.

The demo data defines default messages in this channel, but were
incorrectly linked to this channel, resulting in this channel
containing no messages initially.

The messages did not define `channel_ids`, so it was considered
empty. This field is essential for displaying the message in
channel, so by being omitted these messages are not properly linked
to channels.

This commit fixes the issue by correctly linked this demo messages
to this demo channel, so that `#general` now contains some messages
initially. This commit also removes unused context
`mail_notify_noemail`.

Task-Id 2186300

closes odoo/odoo#49539

Signed-off-by: Alexandre Kühn (aku) <aku@odoo.com>

Below takes only one 'l', not two. Fix typo in

 * tooltip of create button;
 * mail demo data;
 * comment in stock

This commit is related to task/bug ID 1870964 and closes PR #26099.

        Functional
        ==========

Sales teams become sales channels. Their dashboard cards now include a graph
displaying customizable data for managers (comparable to those in accounting).

By default, you now have the following sales channels (non-demo):

      Direct Sales      (with installation of crm or sale)

  Sales Channel type: Sales
  Works same as before, what's changed is:
    - their cards display one big button directing to the start of their
      workflow
    - the links on the right-hand side have been reworked, and are only
      displayed when there is at least one item requiring attention.
    - 'More' tab remains unchanged.

      Website           (with installation of website_sale)

  Sales Channel type: Website
  Differences lies in the links displayed in the dashboard card:
    - it displays abandoned carts, awaiting payments and payments to capture
  Default Channel linked to all sales made from the eCommerce.

      Point of Sale     (with installation of sale and point_of_sale
                                              -> auto-installs pos_sale)

  Sales Channel type: Point of Sale
  Linked to pos.configs and their pos.sessions and pos.orders.
    - only links to their linked pos.config dashboard and open sessions
    - can't use opportunities, lead or invoicing and can only display
      pos.order data in the graph.
  Default Channel linked to the default pos.config.

        Technical
        =========

- Add a channel type: sales, pos, website that have different actions/settings
- Add a graphs to the kanban cards in the sales/crm dashboard, configurable in
  the form view in the new dashboard page.
- Rename sales teams to sales channels, rename and add default and demo sales
  channels
- Change dashboard links depending on the channel type and add a related
  computed fields on crm.team
- Rename strings and improve channel form view.
- Leads are now checked by default once activated for 'sales' type channels
- Disable checking "leads" without using "opportunities".
- Hide invoicing and invoicing target depending on channel type.
- Move currency_id to sales_team

- less tweaks
- improve default channel name
- clean origin channel names in Inbox and Starred
- reduce fadeout duration in threads

Main changes :
- mail.notification model is removed. People do not receive notifications
anymore. Instead two ways of following documents exist
  - using a channel; messages will be displayed on the channel itself
  in a near future commit
  - following with its partner; messages will all be considered as
  needaction, using a new m2m table. People should receive less
  needaction messages by following less records by themselves.
There is no more read / unread state anymore. Instead only needaction
messages are considered. Todo (Favorites) messages still exist, and are
stores on a new m2m table instead of using decorated notifciations.
- the main filter for documents is not message_unread anymore, but
message_needaction. A lot of views and filters have been updated
accordingly.
- the vote feature has been removed

Followers can now be partners or channels. Partners following a document
will receive needaction, as previously. However people can follow documents
through channels. Members of a channel are able to listen to a stream
of messages using the channel. Those messages do not create needaction
messages. It is therefore possible to follow documents without receiving
too much notifications. For interesting documents subscribing with its
partner will create notification.

message_follower_ids fields is udpated. It is now a many2many to
mail.followers, not to res.partner anymore. A subscription can be either
a partner (partner_id) or a channel (channel_id).

Some access rules have been updated accordingly.

and a bit more messages.