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/misc/emscripten/SDL_sysurl.c

@@ -23,15 +23,14 @@
 
 #include <emscripten/emscripten.h>
 
-int
-SDL_SYS_OpenURL(const char *url)
+int SDL_SYS_OpenURL(const char *url)
 {
     EM_ASM({
         window.open(UTF8ToString($0), "_blank");
-    }, url);
+    },
+           url);
 
     return 0;
 }
 
 /* vi: set ts=4 sw=4 expandtab: */
-