Add full emoji picker for reactions

Signed-off-by: Tulir Asokan <tulir@maunium.net>

src/components/views/emojipicker/Emoji.js

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+/*
+Copyright 2019 Tulir Asokan
+
+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 React from 'react';
+import PropTypes from 'prop-types';
+
+class Emoji extends React.PureComponent {
+    static propTypes = {
+        onClick: PropTypes.func,
+        onMouseEnter: PropTypes.func,
+        onMouseLeave: PropTypes.func,
+        emoji: PropTypes.object.isRequired,
+    };
+
+    render() {
+        const { onClick, onMouseEnter, onMouseLeave, emoji } = this.props;
+        return (
+            <li onClick={() => onClick(emoji)}
+                onMouseEnter={() => onMouseEnter(emoji)}
+                onMouseLeave={() => onMouseLeave(emoji)}
+                className="mx_EmojiPicker_item">
+                {emoji.unicode}
+            </li>
+        )
+    }
+}
+
+export default Emoji;