Dotcase: Improve handling of notifications

Handle and draw notifications in the order they are returned by the
INotificationManager (i.e., the order they were posted). This new
handling is also easier to extend with new apps (for existing sprites)
and new sprites altogether.

Also, if there are more than 6 notifications to draw, only draw the
first 5 and add a "..." sprite at the end. Now that we have a way to
handle more than 6 notifications, we can add more types of
notifications.

PS2: Use a Map instead of a bunch of Sets to map package names to
notification types

Change-Id: I4eba49420fb56028610a306585a977462c6f4113
Dotcase: use real twitter blue

Change-Id: I68e081bc7f224cc999d8b86ef6728b748eb3a2fc
Dotcase: Support additional apps

- Added support and sprites for email, snapchat, and facebook
- Added a pile of email, twitter, and mms apps

Change-Id: Ief355abfa953cca76b0b1fa2ad05c4b7a82fe6f9
Dotcase: add more constants to DotcaseConstants

Add more constants from other classes into DotcaseConstants and
final-ize more members

Change-Id: Ibc198dba8e404d7181459d7beb39b8748466386c