make Sdl and subsystem structs zero sized #102
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I also suspect that EventSubsystem::sdl is unsound, because it is Sync this can be called from any thread, not only the main thread, effectively copying instances of the Sdl struct to other threads. |
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These structs kept no state, only constants.
Also prevents
SDL_COUNTfrom being modified from other threads than the main thread by keeping one count per subsystem type, not instance.