Merge changes from topic "notification_reply_action" into pi-dev

* changes:
  Cleaned up the paddings of the messaging layout and smart replies
  Changed the size of the largeIcon
  Moved the disabling from alpha to manual color blending
  Updated the color of the reply button to be more neutral
  Updated the reply icon
  Disabled reply action when pending intents are cancelled
  Split the reply icon permanently from the right icon