Timeline Reactions: Emoji picker (#350)

* Screens template

* Loading and parsing

* Gridview

* New json

* Search method

* Unit tests

* Added emoji provider state

* Removed containsIgnoringCase

* Added plus icon, added double tap gesture, dismiss sheet after selecting emoji

* Renamed EmojisProvider to EmojiProvider

* Renamed EmojiPickerScreenScreen

* Extra padding

* Renamed EmojisLoaderProtocol

* Category names

* Moved method into public section of the class

* Return all categories when search string is empty

* Added cancel button and tittle

* Removed empty lines

* Removed swiftlint warning

ElementX/Sources/Screens/RoomScreen/View/RoomScreen.swift

@@ -19,6 +19,7 @@ import SwiftUI
 struct RoomScreen: View {
     @ObservedObject private var settings = ElementSettings.shared
     @ObservedObject var context: RoomScreenViewModel.Context
+    @State private var showReactionsMenuForItemId = ""
     
     var body: some View {
         timeline