Update WTL to 9.0.

This was needed for compatibility with the new ATL in VS 2013.
Disable /SAFESEH for two projects.

Because we link against a prebuilt htmlhelp.lib, we can't use /safeseh in
said projects. This applies to x86 only anyhow.
Remove refs to memtest.h and add shellapi.h

We need shellapi.h because WTL attempts to call ShellExecute without including
this header.