Add New Recovery Method dialog

Adds a New Recovery Method dialog which is shown when key backup fails because
of a version mismatch / version not found error.

The set up button in the dialog currently only marks a device as verified (via a
verification prompt) instead of the eventual restore and cross-sign flow, since
those pieces don't exist yet.

Signed-off-by: J. Ryan Stinnett <jryans@gmail.com>

res/css/_common.scss

@@ -34,7 +34,7 @@ body {
     -webkit-font-smoothing: subpixel-antialiased;
 }
 
-div.error, div.warning {
+.error, .warning {
     color: $warning-color;
 }
 

res/css/_components.scss

@@ -47,6 +47,7 @@
 @import "./views/dialogs/_ShareDialog.scss";
 @import "./views/dialogs/_UnknownDeviceDialog.scss";
 @import "./views/dialogs/keybackup/_CreateKeyBackupDialog.scss";
+@import "./views/dialogs/keybackup/_NewRecoveryMethodDialog.scss";
 @import "./views/dialogs/keybackup/_RestoreKeyBackupDialog.scss";
 @import "./views/directory/_NetworkDropdown.scss";
 @import "./views/elements/_AccessibleButton.scss";

res/css/views/dialogs/keybackup/_NewRecoveryMethodDialog.scss

@@ -0,0 +1,41 @@
+/*
+Copyright 2018 New Vector Ltd
+
+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.
+*/
+
+.mx_NewRecoveryMethodDialog .mx_Dialog_title {
+    margin-bottom: 32px;
+}
+
+.mx_NewRecoveryMethodDialog_title {
+    position: relative;
+    padding-left: 45px;
+    padding-bottom: 10px;
+
+    &:before {
+        mask: url("../../../img/e2e/lock-warning.svg");
+        mask-repeat: no-repeat;
+        background-color: $primary-fg-color;
+        content: "";
+        position: absolute;
+        top: -6px;
+        right: 0;
+        bottom: 0;
+        left: 0;
+    }
+}
+
+.mx_NewRecoveryMethodDialog .mx_Dialog_buttons {
+    margin-top: 36px;
+}

res/img/e2e/lock-warning.svg

@@ -0,0 +1 @@
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