Fix build for Windows

[cpadilla]

I butchered a lot of the Windows code (ie #define WARPENGINE_API __declspec(dllexport)) in order to get the build working on linux.

If someone wants to get the build working on Windows again, ideally you would configure the CMakelists.txt to generate a visual studio solution to build the project. The two directories (SpacePirates and WarpEngine) should be their own projects in the visual studio solution.

Alternatively, you could have cmake generate a .vscode folder with tasks and build files to build and run within VS code.

Instructions for building in windows should be added to the Readme.