Reactions: Add primary reactions as message actions

Riot/Modules/Room/ContextualMenu/ReactionsMenu/ReactionsMenuAction.swift

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+/*
+ Copyright 2019 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
+
+/// TemplateScreenViewController view actions exposed to view model
+enum ReactionsMenuAction {
+    case react(String)
+    case unreact(String)
+}