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/Screen.h

@@ -19,16 +19,15 @@ public:
     void ResizeToNearestMultiple(void);
     void GetWindowSize(int* x, int* y);
 
-    void UpdateScreen(SDL_Surface* buffer, SDL_Rect* rect);
-    void FlipScreen(bool flipmode);
-
-    const SDL_PixelFormat* GetFormat(void);
+    void RenderPresent();
 
     void toggleFullScreen(void);
     void toggleScalingMode(void);
     void toggleLinearFilter(void);
     void toggleVSync(void);
 
+    void recacheTextures(void);
+
     bool isForcedFullscreen(void);
 
     bool isWindowed;
@@ -39,8 +38,6 @@ public:
 
     SDL_Window *m_window;
     SDL_Renderer *m_renderer;
-    SDL_Texture *m_screenTexture;
-    SDL_Surface* m_screen;
 };
 
 #ifndef GAMESCREEN_DEFINITION