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/RoomScreenViewModel.swift

@@ -91,6 +91,7 @@ class RoomScreenViewModel: RoomScreenViewModelType, RoomScreenViewModelProtocol
 
     var callback: ((RoomScreenViewModelAction) -> Void)?
     
+    // swiftlint:disable:next cyclomatic_complexity
     override func process(viewAction: RoomScreenViewAction) async {
         switch viewAction {
         case .paginateBackwards:
@@ -108,6 +109,10 @@ class RoomScreenViewModel: RoomScreenViewModelType, RoomScreenViewModelProtocol
         case .sendReaction(let key, _):
             #warning("Reaction implementation awaiting SDK support.")
             MXLog.warning("React with \(key) failed. Not implemented.")
+        case .displayEmojiPicker(let itemId):
+            callback?(.displayEmojiPicker(itemId: itemId))
+        case .displayReactionsMenuForItemId(let itemId):
+            state.displayReactionsMenuForItemId = itemId
         case .cancelReply:
             state.composerMode = .default
         case .cancelEdit: