Emoji picker: Handle Emoji parsing with EmojiService.

Riot/Modules/Room/EmojiPicker/Data/Store/EmojiItem.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
+
+struct EmojiItem {
+    let identifier: String
+    let value: String
+    let name: String
+    let shortNames: [String]
+    let keywords: [String]    
+    let variations: [EmojiItem]
+    
+    init(identifier: String,
+         value: String,
+         name: String,
+         shortNames: [String] = [],
+         keywords: [String] = [],
+         variations: [EmojiItem] = []) {
+        
+        self.identifier = identifier
+        self.value = value
+        self.name = name
+        self.shortNames = shortNames
+        self.keywords = keywords
+        self.variations = variations
+    }
+}