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.xcodeproj/project.pbxproj

@@ -5801,7 +5801,7 @@
 			repositoryURL = "https://github.com/matrix-org/matrix-rust-components-swift";
 			requirement = {
 				kind = exactVersion;
-				version = 1.1.20;
+				version = 1.1.21;
 			};
 		};
 		821C67C9A7F8CC3FD41B28B4 /* XCRemoteSwiftPackageReference "emojibase-bindings" */ = {

ElementX.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved

@@ -129,8 +129,8 @@
       "kind" : "remoteSourceControl",
       "location" : "https://github.com/matrix-org/matrix-rust-components-swift",
       "state" : {
-        "revision" : "5f3a195f6a461b4d40a8a705a3af8235711f12f5",
-        "version" : "1.1.20"
+        "revision" : "22461632db17a6dc1193dcdcfa3231614649c517",
+        "version" : "1.1.21"
       }
     },
     {