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Associated code will be removed once confirmed deletions do not break builds

Code surrounding 'RealOpenMMType == 0' will be removed 
once confirmed free-energy plugin code does not break

move the plugin to its own project.
This change might also simplify pyopenmm nightly test issues.

Added #include <cstdlib> to header files so would work with gcc 4.4.2.  Also changed includes of stdlib.h and string.h to cstdlib.h and cstring.h

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day when we try it on Windows.
Added "-isysroot /Developer/SDKs/MacOSX10.5.sdk -mmacosx-version-min=10.5" to Mac compile flags,
to possibly help run on Leopard.

Chris begged me to check this in, so this adds the missing OPENMM_EXPORT to the Cuda platform's registerPlatforms method.