feat: Events / audit log (#1008)

* feat: Record events in DB

* feat: events API

* First pass, hacky activity feed

* WIP

* Reset dashboard

* feat: audit log UI
feat: store ip address

* chore: Document events.list api

* fix: command specs

* await event create

* fix: backlinks service

* tidy

* fix: Hide audit log menu item if not admin

app/models/Event.js

@@ -0,0 +1,33 @@
+// @flow
+import BaseModel from './BaseModel';
+import User from './User';
+
+class Event extends BaseModel {
+  id: string;
+  name: string;
+  modelId: ?string;
+  actorId: string;
+  actorIpAddress: ?string;
+  documentId: string;
+  collectionId: ?string;
+  userId: string;
+  createdAt: string;
+  actor: User;
+  data: { name: string, email: string };
+
+  get model() {
+    return this.name.split('.')[0];
+  }
+
+  get verb() {
+    return this.name.split('.')[1];
+  }
+
+  get verbPastTense() {
+    const v = this.verb;
+    if (v.endsWith('e')) return `${v}d`;
+    return `${v}ed`;
+  }
+}
+
+export default Event;