Improvements and Updates

• On the Messaging App settings you can now select the sender of the welcome message.
• Improved the workflow for adding new apps on the App Setup page.
• Improved the rankings of results on the Command Bar. We now surface actions that you're more likely to use at the top.
• Improved the behavior of the client details sidebar on mobile.
• Improved the layout of various settings pages.
• Fixed a bug where if you delete a files channel no other channel gets selected.
• [API] Updated the name of profile picture property on client objects to avatarImageUrl.