Implement UI tweaks

* Correct allignment of mailbox label
* Sender info & presence alignment fixed
* Header height corrected
* Sender header updated; new asset for background & remove the "fold" asset
* New asset icon and allignment for "show pictures"
* Selected rows have updated background; new assets
* New asset for checked items
* Update divider to be 2px high
* Update selected background for wide message list

bug 3510984

Change-Id: I028ed5619ea7127b0392d9f5b7b00c575b00f3c6
25 files changed