Update for SDL3 coding style (#6717)

I updated .clang-format and ran clang-format 14 over the src and test directories to standardize the code base.

In general I let clang-format have it's way, and added markup to prevent formatting of code that would break or be completely unreadable if formatted.

The script I ran for the src directory is added as build-scripts/clang-format-src.sh

This fixes:
#6592
#6593
#6594

(cherry picked from commit 5750bcb174)

src/main/uikit/SDL_uikit_main.c

@@ -12,8 +12,7 @@
 #undef main
 #endif
 
-int
-main(int argc, char *argv[])
+int main(int argc, char *argv[])
 {
     return SDL_UIKitRunApp(argc, argv, SDL_main);
 }