Simple rendering of the room list for visual aid

This is largely meant to prove the algorithm works and nothing more.

src/components/views/rooms/RoomSublist2.tsx

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+/*
+Copyright 2015, 2016 OpenMarket Ltd
+Copyright 2017, 2018 Vector Creations Ltd
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import * as React from "react";
+import { Room } from "matrix-js-sdk/src/models/room";
+
+interface IProps {
+    forRooms: boolean;
+    rooms?: Room[];
+    startAsHidden: boolean;
+    label: string;
+    onAddRoom?: () => void;
+    addRoomLabel: string;
+    isInvite: boolean;
+
+    // TODO: Collapsed state
+    // TODO: Height
+    // TODO: Group invites
+    // TODO: Calls
+    // TODO: forceExpand?
+    // TODO: Header clicking
+    // TODO: Spinner support for historical
+}
+
+interface IState {
+}
+
+// TODO: Actually write stub
+export class RoomSublist2 extends React.Component<IProps, IState> {
+    public setHeight(size: number) {
+    }
+
+    public render() {
+        // TODO: Proper rendering
+
+        const rooms = this.props.rooms.map(r => (
+            <div key={r.roomId}>{r.name} ({r.roomId})</div>
+        ));
+        return (
+            <div>
+                <h4>{this.props.label}</h4>
+                {rooms}
+            </div>
+        );
+    }
+}