* Scan folders and write into child cursors
* Clicking a folder takes you to MessageList
* Remove most links to FolderMessageList (nearly dead!)
* Repair 1-account startup behavior (takes you directly to inbox)
* Cleanup a few basic things like context menus & refresh
TODO: Magic mailbox section at the top
TODO: As always, better linkage to sync engine(s)
TODO: Menus, context menus, etc.
TODO: Proper handling of expandable list - accounts should stay open?
* Automatically marked read when entering MessageView
* Marked unread via menu selected during MessageView
* Provider updated (directly - see note)
* Enable context menu in MessageList and enable "open" & toggle unread
NOTE: Does not use the correct service notifications yet; Just updates
the providers.
NOTE: The UI for the context menu is incomplete, it says "mark as read"
but it actually toggles the state. The true UI is to flip the text to
match the current state e.g. "mark as read" or "mark as unread". That
will be much simpler to implement when we switch to a custom list item
view class, where we can cache the read/unread state (and other tidbits).
* Add MessageList Activity class and Manifest entry
* Add appropriate layouts, views, etc.
* Wire into FolderMessageList
Lots to do, but this gives us a useable screen.
