Move inbox to its own model (#10428)

* shared model for chat and inbox

* disable inbox schema

* inbox: use separate model

* remove old code that used group.chat

* add back chat field (not used) and remove old tests

* remove inbox exclusions when loading user

* add GET /api/v3/inbox/messages

* add comment

* implement DELETE /inbox/messages/:messageid in v4

* implement GET /inbox/messages in v4 and update tests

* implement DELETE /api/v4/inbox/clear

* fix url

* fix doc

* update /export/inbox.html

* update other data exports

* add back messages in user schema

* add user.toJSONWithInbox

* add compativility until migration is done

* more compatibility

* fix tojson called twice

* add compatibility methods

* fix common tests

* fix v4 integration tests

* v3 get user -> with inbox

* start to fix tests

* fix v3 integration tests

* wip

* wip, client use new route

* update tests for members/send-private-message

* tests for get user in v4

* add tests for DELETE /inbox/messages/:messageId

* add tests for DELETE /inbox/clear in v4

* update docs

* fix tests

* initial migration

* fix migration

* fix migration

* migration fixes

* migrate api.enterCouponCode

* migrate api.castSpell

* migrate reset, reroll, rebirth

* add routes to v4 version

* fix tests

* fixes

* api.updateUser

* remove .only

* get user -> userLib

* refactor inbox.vue to work with new data model

* fix return message when messaging yourself

* wip fix bug with new conversation

* wip

* fix remaining ui issues

* move api.registerLocal, fixes

* keep only v3 version of GET /inbox/messages

website/server/models/user/schema.js

@@ -558,11 +558,13 @@ let schema = new Schema({
   tags: [TagSchema],
 
   inbox: {
-    newMessages: {type: Number, default: 0},
-    blocks: {type: Array, default: () => []},
+    // messages are stored in the Inbox collection, this path will be removed
+    // as soon as the migration has run and all the messages have been removed from here
     messages: {type: Schema.Types.Mixed, default: () => {
       return {};
     }},
+    newMessages: {type: Number, default: 0},
+    blocks: {type: Array, default: () => []},
     optOut: {type: Boolean, default: false},
   },
   tasksOrder: {