Further design updates to the timeline. (#524)

- Decryption banner on the timeline
- Bubble colours
- Background insets
- Multiline composer corner radius
- Read marker
- GIF indicator
- Reactions shape
- Use RoomTimelineViewLabelStyle everywhere possible
- Only set a line limit on reply quotes, allow all the lines for regular quotes.
- Message label icons
- Yes/No button casing
- Make sender profiles immutable.
- Enable copy link and invite buttons.
- Fix layout loop detecting multiline composer text.
- Add animation to the encryption banner.

ElementX/Sources/Services/Timeline/TimelineItemContent/MessageTimelineItem.swift

@@ -17,6 +17,7 @@
 import CoreGraphics
 import Foundation
 import MatrixRustSDK
+import UniformTypeIdentifiers
 
 /// A protocol that contains the base `m.room.message` event content properties.
 /// The `CustomStringConvertible` conformance is to redact specific properties from the logs.
@@ -95,6 +96,10 @@ extension MessageTimelineItem where Content == MatrixRustSDK.ImageMessageContent
     var blurhash: String? {
         content.info?.blurhash
     }
+    
+    var type: UTType? {
+        content.info?.mimetype.flatMap { UTType(mimeType: $0) }
+    }
 }
 
 extension MatrixRustSDK.VideoMessageContent: MessageContentProtocol { }