extract manual device verification out of device verify dialog

as the plan is to remove the latter

src/components/views/dialogs/ManualDeviceKeyVerificationDialog.js

@@ -0,0 +1,91 @@
+/*
+Copyright 2016 OpenMarket Ltd
+Copyright 2017 Vector Creations Ltd
+Copyright 2019 New Vector Ltd
+Copyright 2019 Michael Telatynski <7t3chguy@gmail.com>
+
+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';
+import {MatrixClientPeg} from '../../../MatrixClientPeg';
+import * as sdk from '../../../index';
+import * as FormattingUtils from '../../../utils/FormattingUtils';
+import { _t } from '../../../languageHandler';
+
+export default class ManualDeviceKeyVerificationDialog extends React.Component {
+    static propTypes = {
+        userId: PropTypes.string.isRequired,
+        device: PropTypes.object.isRequired,
+        onFinished: PropTypes.func.isRequired,
+    };
+
+    _onCancelClick = () => {
+        this.props.onFinished(false);
+    }
+
+    _onLegacyFinished = (confirm) => {
+        if (confirm) {
+            MatrixClientPeg.get().setDeviceVerified(
+                this.props.userId, this.props.device.deviceId, true,
+            );
+        }
+        this.props.onFinished(confirm);
+    }
+
+    render() {
+        const QuestionDialog = sdk.getComponent("dialogs.QuestionDialog");
+        const AccessibleButton = sdk.getComponent('views.elements.AccessibleButton');
+
+        let text;
+        if (MatrixClientPeg.get().getUserId() === this.props.userId) {
+            text = _t("To verify that this session can be trusted, please check that the key you see " +
+                "in User Settings on that device matches the key below:");
+        } else {
+            text = _t("To verify that this session can be trusted, please contact its owner using some other " +
+                "means (e.g. in person or a phone call) and ask them whether the key they see in their User Settings " +
+                "for this session matches the key below:");
+        }
+
+        const key = FormattingUtils.formatCryptoKey(this.props.device.getFingerprint());
+        const body = (
+            <div>
+                <p>
+                    { text }
+                </p>
+                <div className="mx_DeviceVerifyDialog_cryptoSection">
+                    <ul>
+                        <li><label>{ _t("Session name") }:</label> <span>{ this.props.device.getDisplayName() }</span></li>
+                        <li><label>{ _t("Session ID") }:</label> <span><code>{ this.props.device.deviceId }</code></span></li>
+                        <li><label>{ _t("Session key") }:</label> <span><code><b>{ key }</b></code></span></li>
+                    </ul>
+                </div>
+                <p>
+                    { _t("If it matches, press the verify button below. " +
+                        "If it doesn't, then someone else is intercepting this session " +
+                        "and you probably want to press the blacklist button instead.") }
+                </p>
+            </div>
+        );
+
+        return (
+            <QuestionDialog
+                title={_t("Verify session")}
+                description={body}
+                button={_t("I verify that the keys match")}
+                onFinished={this._onLegacyFinished}
+            />
+        );
+    }
+}