Emoji picker: Implement Emoji picker screen.

Riot/Modules/Room/EmojiPicker/EmojiPickerCoordinator.swift

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+// File created from ScreenTemplate
+// $ createScreen.sh toto EmojiPicker
+/*
+ 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
+import UIKit
+
+final class EmojiPickerCoordinator: EmojiPickerCoordinatorType {
+    
+    // MARK: - Properties
+    
+    // MARK: Private
+    
+    private let session: MXSession
+    private let roomId: String
+    private let eventId: String
+    private let router: NavigationRouter
+    
+    // MARK: Public
+
+    // Must be used only internally
+    var childCoordinators: [Coordinator] = []
+    
+    weak var delegate: EmojiPickerCoordinatorDelegate?
+    
+    // MARK: - Setup
+    
+    init(session: MXSession, roomId: String, eventId: String) {
+        self.session = session
+        self.roomId = roomId
+        self.eventId = eventId
+        self.router = NavigationRouter(navigationController: RiotNavigationController())
+    }
+    
+    // MARK: - Public methods
+    
+    func start() {
+        let emojiPickerViewModel = EmojiPickerViewModel(session: self.session, roomId: self.roomId, eventId: self.eventId)
+        let emojiPickerViewController = EmojiPickerViewController.instantiate(with: emojiPickerViewModel)
+        emojiPickerViewModel.coordinatorDelegate = self
+        self.router.setRootModule(emojiPickerViewController)
+    }
+    
+    func toPresentable() -> UIViewController {
+        return self.router.toPresentable()
+    }
+}
+
+// MARK: - EmojiPickerViewModelCoordinatorDelegate
+extension EmojiPickerCoordinator: EmojiPickerViewModelCoordinatorDelegate {
+    func emojiPickerViewModel(_ viewModel: EmojiPickerViewModelType, didAddEmoji emoji: String, forEventId eventId: String) {
+        self.delegate?.emojiPickerCoordinator(self, didAddEmoji: emoji, forEventId: eventId)
+    }
+    
+    func emojiPickerViewModel(_ viewModel: EmojiPickerViewModelType, didRemoveEmoji emoji: String, forEventId eventId: String) {
+        self.delegate?.emojiPickerCoordinator(self, didRemoveEmoji: emoji, forEventId: eventId)
+    }
+    
+    func emojiPickerViewModelDidCancel(_ viewModel: EmojiPickerViewModelType) {
+        self.delegate?.emojiPickerCoordinatorDidCancel(self)
+    }
+}