MSVS: Add libluratech to project.

This will only be built in "DebugCommercial" "ReleaseCommercial" and
"MementoCommercial" configuration builds.

A note on the way MSVS solutions work; libluratech is listed as
a dependency of the executables - this applies to ALL configurations.
In order to stop normal builds failing when we have no source, we
set each non "Commercial" configuration to not build libluratech.

The linker still looks for the output from the libluratech stage
to link in though, so for all non "Commercial" configurations, we
have the libluratech stage set to produce output named " ". This
is copied into the linker command line, and all is happy.

The sole downside to this is that if we try to build libluratech
in "Debug" (say) rather than "DebugCommercial", the build will
fail at the library making step. This will never happen unless
we manually try to build that project in that configuration though.

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