nil out CurrentHedgehog in FreeModule, add a test for nil'd CurrentHedgehog in DelCI since I'd still like to use DeleteGear for the other stuff it does. Move some variable initialiasations in AI Misc to hopefully avoid some uninit val errors.

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find_package(SDL REQUIRED)

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include_directories(${SDL_INCLUDE_DIR})

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add_library (SDLmain STATIC SDLMain.m)

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