[Leash] Notify the user of password change success

ticket: 7440
tags: pullup
target_version: 1.11.4
Build with Visual Studio 2012

It's more aggressive about enforcing that keywords are not macros
in C++ mode, and has bumped the MFC version to 11.

Keep compatibility with older versions of Visual Studio, appropriately
conditionalized.

ticket: 7664 (new)
tags: pullup
target_version: 1.11.4