ALLJOYN-2210 Increase the compiler warning level from /W1 to /W2

Some additional changes were made in response to the changes to update the
warning level.  We now define _CRT_SECURE_NO_WARNINGS to prevent warnings
when we use functions like strncpy. The C4345 warning was added to the list
of disabled warnings.

Change-Id: Ie0fe63f9c5eceb32d4fa2c67b5e7aa86329121eb