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/windows/SDL_windows_main.c

@@ -16,12 +16,11 @@
 #include "SDL_main.h"
 
 #ifdef main
-#  undef main
+#undef main
 #endif /* main */
 
 /* Pop up an out of memory message, returns to Windows */
-static BOOL
-OutOfMemory(void)
+static BOOL OutOfMemory(void)
 {
     SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Fatal Error", "Out of memory - aborting", NULL);
     return FALSE;
@@ -29,16 +28,15 @@ OutOfMemory(void)
 
 #if defined(_MSC_VER)
 /* The VC++ compiler needs main/wmain defined */
-# define console_ansi_main main
-# if UNICODE
-#  define console_wmain wmain
-# endif
+#define console_ansi_main main
+#if UNICODE
+#define console_wmain wmain
+#endif
 #endif
 
 /* Gets the arguments with GetCommandLine, converts them to argc and argv
    and calls SDL_main */
-static int
-main_getcmdline(void)
+static int main_getcmdline(void)
 {
     LPWSTR *argvw;
     char **argv;
@@ -91,17 +89,14 @@ main_getcmdline(void)
 }
 
 /* This is where execution begins [console apps, ansi] */
-int
-console_ansi_main(int argc, char *argv[])
+int console_ansi_main(int argc, char *argv[])
 {
     return main_getcmdline();
 }
 
-
 #if UNICODE
 /* This is where execution begins [console apps, unicode] */
-int
-console_wmain(int argc, wchar_t *wargv[], wchar_t *wenvp)
+int console_wmain(int argc, wchar_t *wargv[], wchar_t *wenvp)
 {
     return main_getcmdline();
 }