Composer update - UI enhancements

- Composer height =58px - Frame = 42px
- Replace current scroll to bottom implementation with a scroll to Bottom FAB on both themes
- The text inside the composer frame should be centered
- The padding between the "reveal plus" button, composer frame and Left + Right sides should be at equal distance on default mode
- Verify that the "Send a message..." String matches with the colour indicated on Figma.
- The padding between each component (buttons and composer frame) should be at equal distance on default mode. E.g : It should be at 12px for each gap.
- The input text jumps down when users start typing. It should be centered at all times.
- Remove the Scroll bar in the text frame.
- DARK THEME

Riot/Modules/Room/RoomViewController.h

@@ -27,6 +27,8 @@
 
 #import "UIViewController+RiotSearch.h"
 
+@class BadgeLabel;
+
 /**
  Notification string used to indicate call tile tapped in a room. Notification object will be the `RoomBubbleCellData` object.
  */
@@ -47,6 +49,8 @@ extern NSNotificationName const RoomCallTileTappedNotification;
 @property (weak, nonatomic) IBOutlet UIButton *resetReadMarkerButton;
 @property (weak, nonatomic) IBOutlet UIView *jumpToLastUnreadBannerSeparatorView;
 @property (weak, nonatomic) IBOutlet UIVisualEffectView *inputBackgroundView;
+@property (weak, nonatomic) IBOutlet UIButton *scrollToBottomButton;
+@property (weak, nonatomic) IBOutlet BadgeLabel *scrollToBottomBadgeLabel;
 
 /**
  Preview data for a room invitation received by email, or a link to a room.
@@ -73,5 +77,7 @@ extern NSNotificationName const RoomCallTileTappedNotification;
  */
 - (IBAction)onButtonPressed:(id)sender;
 
+- (IBAction)scrollToBottomAction:(id)sender;
+
 @end