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.

DesignKit/Sources/Colors/ElementColors.swift

@@ -67,22 +67,19 @@ public struct ElementColors {
     
     // MARK: - Temp
     
-    private var tempActionBlack: UIColor { UIColor(red: 20 / 255, green: 20 / 255, blue: 20 / 255, alpha: 1.0) }
-    
-    public var tempActionBackground: Color {
+    public var bubblesYou: Color {
         Color(UIColor { collection in
-            collection.userInterfaceStyle == .light ? tempActionBlack : .white
+            // Note: Light colour doesn't currently match Figma.
+            collection.userInterfaceStyle == .light ? .element.systemGray5 : UIColor(red: 0.16, green: 0.18, blue: 0.21, alpha: 1)
         })
     }
     
-    public var tempActionForeground: Color {
+    public var bubblesNotYou: Color {
         Color(UIColor { collection in
-            collection.userInterfaceStyle == .light ? .white : tempActionBlack
+            // Note: Light colour doesn't currently match Figma.
+            collection.userInterfaceStyle == .light ? .element.systemGray6 : .element.system
         })
     }
-    
-    public var tempActionBackgroundTint: Color { tempActionBackground.opacity(0.2) }
-    public var tempActionForegroundTint: Color { tempActionForeground.opacity(0.2) }
 }
 
 // MARK: UIKit