Added new shape_oval_orange drawable to be shown when the comment is unmoderated.

Indexed a boolean in Simperium for if the notification is an unmoderated comment.
Added a `localStatus` property to `Note`.

Allows to optimistically set the note's comment status so that we don't need to wait for Simperium to return the change after the moderation network call completes.
Check if the changed note is a comment before nulling the `localStatus`
Merge pull request #1920 from wordpress-mobile/issue/1916-notifications-unmoderated-icon-color

Added orange noticon background for unmoderated comments