feat: Memberships (#1032)

* WIP

* feat: Add collection.memberships endpoint

* feat: Add ability to filter collection.memberships with query

* WIP

* Merge stashed work

* feat: Add ability to filter memberships by permission

* continued refactoring

* paginated list component

* Collection member management

* fix: Incorrect policy data sent down after collection.update

* Reduce duplication, add empty state

* cleanup

* fix: Modal close should be a real button

* fix: Allow opening edit from modal

* fix: remove unused methods

* test: fix

* Passing test suite

* Refactor

* fix: Flow UI errors

* test: Add collections.update tests

* lint

* test: moar tests

* fix: Missing scopes, more missing tests

* fix: Handle collection privacy change over socket

* fix: More membership scopes

* fix: view endpoint permissions

* fix: respond to privacy change on socket event

* policy driven menus

* fix: share endpoint policies

* chore: Use policies to drive documents UI

* alignment

* fix: Header height

* fix: Correct behavior when collection becomes private

* fix: Header height for read-only collection

* send id's over socket instead of serialized objects

* fix: Remote policy change

* fix: reduce collection fetching

* More websocket efficiencies

* fix: Document collection pinning

* fix: Restored ability to edit drafts
fix: Removed ability to star drafts

* fix: Require write permissions to pin doc to collection

* fix: Header title overlaying document actions at small screen sizes

* fix: Jank on load caused by previous commit

* fix: Double collection fetch post-publish

* fix: Hide publish button if draft is in no longer accessible collection

* fix: Always allow deleting drafts
fix: Improved handling of deleted documents

* feat: Show collections in drafts view
feat: Show more obvious 'draft' badge on documents

* fix: incorrect policies after publish to private collection

* fix: Duplicating a draft publishes it

app/components/DropdownMenu/DropdownMenu.js

@@ -4,9 +4,11 @@ import invariant from 'invariant';
 import { observable } from 'mobx';
 import { observer } from 'mobx-react';
 import { PortalWithState } from 'react-portal';
+import { MoreIcon } from 'outline-icons';
 import styled from 'styled-components';
 import Flex from 'shared/components/Flex';
 import { fadeAndScaleIn } from 'shared/styles/animations';
+import NudeButton from 'components/NudeButton';
 
 let previousClosePortal;
 
@@ -15,7 +17,7 @@ type Children =
   | ((options: { closePortal: () => void }) => React.Node);
 
 type Props = {
-  label: React.Node,
+  label?: React.Node,
   onOpen?: () => void,
   onClose?: () => void,
   children?: Children,
@@ -76,7 +78,11 @@ class DropdownMenu extends React.Component<Props> {
           {({ closePortal, openPortal, portal }) => (
             <React.Fragment>
               <Label onClick={this.handleOpen(openPortal, closePortal)}>
-                {label}
+                {label || (
+                  <NudeButton>
+                    <MoreIcon />
+                  </NudeButton>
+                )}
               </Label>
               {portal(
                 <Position