[split] Help compiling HPL1 engine for windows

[Urkle]

Windows builds require Visual Studio 2003 or higher.. (you should be able to easily pickup the Visual Studio Express and then get the Platform SDK). Note that the OALWrapper is currently "missing" a VS Project file, so if someone would like to contribute that.. it would be much appreciated

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And ideally I would like to get the CMake build system working for all 3 platforms so things are easier to maintain.