Updated Inbox message status indicators

Thanks for everyone's feedback! I implemented changes to make the inbox more readable:

⚬ Matching color bar on unread & starred emails ⚬ New icon shows when an email has been opened by the recipient

Based on the feedback, emails that were unread were hard to see at first and the "opened" by recipient status indicator was too close to the "blue" unread indicator. I switched to a new icon for "opened by recipient" emails which works well with a new set of status icons for emails: delivered, opened or bounced.

Check it out at Pingly