Moved the buttons to the header. All other buttons below the message view
go away, so I just hid the old buttons.
Also now we stop trying to hide these buttons when entering contextual mode,
which fixes bug 3044284: Message view buttons get disabled when closing
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Change-Id: Ib178c6221dfab02832a10d0c0441044e4969fb70
BUG:1904421
* update READ/UNREAD indications
** don't change color chip
** change background color
* Change Date
* Change the position of attachement icon
* Change menu icon for folder
BUG: 2065601
* Show Unread Count of Accounts in AccountFolderList
* Change the background according to the folder's type
* Change the style of unread counts
TODO: Change background images of Unread Count
* Attachment icon is displayed when message.mAttachment != 0
* Favorite icon is set/cleared from message but not clickable
* Selection icon is not clickable
Further progress requires implementing a custom child view which can
handle sub-clicks properly.
* 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.
