Implement emotes (/me) (#1841)

* implement emotes (/me)

requires matthew/emotes branch of matrix-rust-sdk

* changelog + whitespace

* remove apparently superfluous swiftlint

* fix constness

* remove inout params and incorporate review

* switch to new api based on sdk PR feedback

* Bump the RustSDK to v1.1.21

* Address PR comments

---------

Co-authored-by: Stefan Ceriu <stefan.ceriu@gmail.com>

ElementX/Sources/Screens/RoomScreen/RoomScreenViewModel.swift

@@ -615,10 +615,16 @@ class RoomScreenViewModel: RoomScreenViewModelType, RoomScreenViewModelProtocol
                 } else {
                     text = messageTimelineItem.body
                 }
+            case .emote(let emoteItem):
+                if ServiceLocator.shared.settings.richTextEditorEnabled, let formattedBodyHTMLString = emoteItem.formattedBodyHTMLString {
+                    text = "/me " + formattedBodyHTMLString
+                } else {
+                    text = "/me " + messageTimelineItem.body
+                }
             default:
                 text = messageTimelineItem.body
             }
-
+            
             actionsSubject.send(.composer(action: .setText(text: text)))
             actionsSubject.send(.composer(action: .setMode(mode: .edit(originalItemId: messageTimelineItem.id))))
         case .copyPermalink: