Extract and start to split theme.

Riot/ModulesSwiftUI/Settings/Notifications/ViewModel/NotificationSettingsViewState.swift

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+// File created from ScreenTemplate
+// $ createScreen.sh Settings/Notifications NotificationSettings
+/*
+ Copyright 2021 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.
+ */
+
+import Foundation
+
+struct NotificationSettingsViewState {
+    var saving: Bool
+    var ruleIds: [NotificationPushRuleId]
+    var selectionState: [NotificationPushRuleId: Bool]
+    var keywords = [String]()
+}