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rename : src/render/direct3d/SDL_d3drender.c => src/render/direct3d/SDL_render_d3d.c
rename : src/render/opengl/SDL_renderer_gl.c => src/render/opengl/SDL_render_gl.c
rename : src/render/opengles/SDL_renderer_gles.c => src/render/opengles/SDL_render_gles.c
rename : src/render/software/SDL_renderer_sw.c => src/render/software/SDL_render_sw.c
rename : src/render/software/SDL_renderer_sw_c.h => src/render/software/SDL_render_sw_c.h

Added a way to get a framebuffer interface for a window, and also a way to create a software renderer for an arbitrary surface.
The software renderer has been re-routed to use the framebuffer interface, which makes it possible to have software rendering available even on simple ports.

Updated copyright to LGPL version 2.1 and year 2010

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Make sure every source file includes SDL_config.h, so the proper system
headers are chosen.

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I batch edited these files, so please let me know if I've accidentally removed anybody's
credit here.

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