Improvements to Bar Captures

We've rolled out some new improvements to the Bar Capture type to allow for more flexibility.

• You can now select whether the Bar floats on top or on the bottom of the page
• Bars can now have logos or avatars uploaded (which makes them nice for announcements)
• There's a few new scroll options to allow you to choose how the bar behaves when the user scrolls on the page (Sticky/Static or Scroll)
• You can now auto-close the bar after x sections when displaying a thank-you message or trigger a callback