Move from surfaces to the SDL render system

Ever since VVVVVV was initially ported to C++ in 2.0, it has used surfaces from SDL. The downside is, that's all software rendering. This commit moves most things off of surfaces, and all into GPU, by using textures and SDL_Renderer.

Pixel-perfect collision has been kept by keeping a copy of sprites as surfaces. There's plans for pixel-perfect collision to use masks instead of reading pixel data directly, but that's out of scope for this commit.

- `graphics.reloadresources()` is now called later in `main`, because textures cannot be created without a renderer.

- This commit also removes a bunch of surface functions which are no longer needed.

- This also recaches target textures in certain places for d3d9.

- graphics.images was converted to a fixed-size array.

- fillbox and fillboxabs use SDL_RenderDrawRect instead of drawing an outline using four filled rectangles

- Update my name in the credits

desktop_version/src/Entity.cpp

@@ -4785,7 +4785,8 @@ void entityclass::collisioncheck(int i, int j, bool scm /*= false*/)
                 colpoint2.y = entities[j].yp;
                 int drawframe1 = entities[i].collisiondrawframe;
                 int drawframe2 = entities[j].drawframe;
-                std::vector<SDL_Surface*>& spritesvec = graphics.flipmode ? graphics.flipsprites : graphics.sprites;
+
+                std::vector<SDL_Surface*>& spritesvec = graphics.flipmode ? graphics.flipsprites_surf : graphics.sprites_surf;
                 if (INBOUNDS_VEC(drawframe1, spritesvec) && INBOUNDS_VEC(drawframe2, spritesvec)
                 && graphics.Hitest(spritesvec[drawframe1],
                                  colpoint1, spritesvec[drawframe2], colpoint2))