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

src/timer/unix/SDL_systimer.c

@@ -71,8 +71,7 @@ static SDL_bool has_monotonic_time = SDL_FALSE;
 static struct timeval start_tv;
 static SDL_bool ticks_started = SDL_FALSE;
 
-void
-SDL_TicksInit(void)
+void SDL_TicksInit(void)
 {
     if (ticks_started) {
         return;
@@ -95,8 +94,7 @@ SDL_TicksInit(void)
     }
 }
 
-void
-SDL_TicksQuit(void)
+void SDL_TicksQuit(void)
 {
     ticks_started = SDL_FALSE;
 }
@@ -176,13 +174,12 @@ SDL_GetPerformanceFrequency(void)
         freq /= mach_base_info.numer;
         return freq;
 #endif
-    } 
-        
+    }
+
     return 1000000;
 }
 
-void
-SDL_Delay(Uint32 ms)
+void SDL_Delay(Uint32 ms)
 {
     int was_error;