ASACORE-971 Make Visual Studio 2013 the default MSVC_VERSION

This change make Visual Studio 2013 the default for windows
builds.  If A different version of Visual Studio is used then
is can be changed by specifying the MSVC_VERSION as part of
the scons command.

Change-Id: I09b7a3a50ccfbe2a7b7cbafede8474d26929ea5e
Signed-off-by: George Nash <georgen@qce.qualcomm.com>
Merge "ASACORE-971 Make Visual Studio 2013 the default MSVC_VERSION" into RB14.12