Clean up launch-time & account setup behaviors.

* Moved welcome message into account setup basics (name/pass)
* Reworked Welcome to go to AccountSetupBasics on count=0
* In AccountFolderList, removed old welcome message code, and add
  code to launch AccountSetupBasics when last account is deleted
* Fixed shortcut picker so launcher shortcuts work again
* Reimplemented shortcut receiver (in MessageList now)
* Default EAS accounts to SSL

Addresses bug 1916583 & 1987440
2 files changed