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/checkkeys.c

@@ -49,8 +49,8 @@ print_string(char **text, size_t *maxlen, const char *fmt, ...)
     len = SDL_vsnprintf(*text, *maxlen, fmt, ap);
     if (len > 0) {
         *text += len;
-        if ( ((size_t) len) < *maxlen ) {
-            *maxlen -= (size_t) len;
+        if (((size_t)len) < *maxlen) {
+            *maxlen -= (size_t)len;
         } else {
             *maxlen = 0;
         }
@@ -121,7 +121,7 @@ PrintModifierState()
 }
 
 static void
-PrintKey(SDL_Keysym * sym, SDL_bool pressed, SDL_bool repeat)
+PrintKey(SDL_Keysym *sym, SDL_bool pressed, SDL_bool repeat)
 {
     char message[512];
     char *spot;
@@ -133,17 +133,17 @@ PrintKey(SDL_Keysym * sym, SDL_bool pressed, SDL_bool repeat)
     /* Print the keycode, name and state */
     if (sym->sym) {
         print_string(&spot, &left,
-                "Key %s:  scancode %d = %s, keycode 0x%08X = %s ",
-                pressed ? "pressed " : "released",
-                sym->scancode,
-                SDL_GetScancodeName(sym->scancode),
-                sym->sym, SDL_GetKeyName(sym->sym));
+                     "Key %s:  scancode %d = %s, keycode 0x%08X = %s ",
+                     pressed ? "pressed " : "released",
+                     sym->scancode,
+                     SDL_GetScancodeName(sym->scancode),
+                     sym->sym, SDL_GetKeyName(sym->sym));
     } else {
         print_string(&spot, &left,
-                "Unknown Key (scancode %d = %s) %s ",
-                sym->scancode,
-                SDL_GetScancodeName(sym->scancode),
-                pressed ? "pressed " : "released");
+                     "Unknown Key (scancode %d = %s) %s ",
+                     sym->scancode,
+                     SDL_GetScancodeName(sym->scancode),
+                     pressed ? "pressed " : "released");
     }
     print_modifiers(&spot, &left);
     if (repeat) {
@@ -159,15 +159,14 @@ PrintText(const char *eventtype, const char *text)
     char expanded[1024];
 
     expanded[0] = '\0';
-    for ( spot = text; *spot; ++spot ) {
+    for (spot = text; *spot; ++spot) {
         size_t length = SDL_strlen(expanded);
         SDL_snprintf(expanded + length, sizeof(expanded) - length, "\\x%.2x", (unsigned char)*spot);
     }
     SDL_Log("%s Text (%s): \"%s%s\"\n", eventtype, expanded, *text == '"' ? "\\" : "", text);
 }
 
-void
-loop()
+void loop()
 {
     SDL_Event event;
     /* Check for events */
@@ -249,8 +248,7 @@ loop()
 #endif
 }
 
-int
-main(int argc, char *argv[])
+int main(int argc, char *argv[])
 {
     /* Enable standard application logging */
     SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
@@ -273,14 +271,14 @@ main(int argc, char *argv[])
                               640, 480, 0);
     if (window == NULL) {
         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create 640x480 window: %s\n",
-                SDL_GetError());
+                     SDL_GetError());
         quit(2);
     }
 
     renderer = SDL_CreateRenderer(window, -1, 0);
     if (renderer == NULL) {
         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create renderer: %s\n",
-                SDL_GetError());
+                     SDL_GetError());
         quit(2);
     }