NXEngine-evo

This is a somewhat rewrite/refactored version of nxengine It tends to be more portable and use cleaner code.

What done:

• Port to SDL2 ( thanks to https://github.com/PIlin/NXEngine-iOS )
• More resolutions and widescreen support up to FullHD (thanks to https://github.com/EXL/NXEngine )
• Fullscreen for any resolution
• Gamepad with force-feedback support.
• Header-dependency hell cleaned up. No more autogenerated headers
• Cleaned up nx.h
• Lists/maps from haiku replaced with std::vector/map
• smalfont -> smallfont
• removed built-in data extractor
• removed replays, as they were buggy/not implemented anyway

Look in TODO for upcoming features

May (and most definitely) contain bugs.