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)

test/testaudioinfo.c

@@ -44,8 +44,7 @@ print_devices(int iscapture)
     }
 }
 
-int
-main(int argc, char **argv)
+int main(int argc, char **argv)
 {
     char *deviceName = NULL;
     SDL_AudioSpec spec;
@@ -98,7 +97,6 @@ main(int argc, char **argv)
         SDL_Log("SDL_AudioFormat: %X\n", spec.format);
     }
 
-
     SDL_Quit();
     return 0;
 }