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/Credits.h

@@ -85,9 +85,9 @@ static const char* patrons[] = {
 /* CONTRIBUTORS.txt, again listed alphabetically (according to `sort`) by first name
  * Misa is special; she gets to be listed in C++ credits alongside Ethan */
 static const char* githubfriends[] = {
+    "Alexandra Fox",
     "AlexApps99",
     "Allison Fleischer",
-    "AllyTally",
     "Brian Callahan",
     "Charlie Bruce",
     "Christoph Böhmwalder",