Switch header convention from #include "SDL.h" to #include <SDL3/SDLh>

I ran this script in the include directory:
```sh
sed -i '' -e 's,#include "\(SDL.*\)",#include <SDL3/\1>,' *.h
```

I ran this script in the src directory:
```sh
for i in ../include/SDL3/SDL*.h
do hdr=$(basename $i)
   if [ x"$(echo $hdr | egrep 'SDL_main|SDL_name|SDL_test|SDL_syswm|SDL_opengl|SDL_egl|SDL_vulkan')" != x ]; then
        find . -type f -exec sed -i '' -e 's,#include "\('$hdr'\)",#include <SDL3/\1>,' {} \;
    else
        find . -type f -exec sed -i '' -e '/#include "'$hdr'"/d' {} \;
    fi
done
```

Fixes https://github.com/libsdl-org/SDL/issues/6575

src/haptic/SDL_syshaptic.h

@@ -24,7 +24,6 @@
 #ifndef SDL_syshaptic_h_
 #define SDL_syshaptic_h_
 
-#include "SDL_haptic.h"
 
 /* Set up for C function definitions, even when using C++ */
 #ifdef __cplusplus

src/haptic/android/SDL_syshaptic.c

@@ -22,12 +22,9 @@
 
 #ifdef SDL_HAPTIC_ANDROID
 
-#include "SDL_timer.h"
 #include "SDL_syshaptic_c.h"
 #include "../SDL_syshaptic.h"
-#include "SDL_haptic.h"
 #include "../../core/android/SDL_android.h"
-#include "SDL_joystick.h"
 #include "../../joystick/SDL_sysjoystick.h"     /* For the real SDL_Joystick */
 #include "../../joystick/android/SDL_sysjoystick_c.h"     /* For joystick hwdata */
 

src/haptic/darwin/SDL_syshaptic.c

@@ -22,10 +22,7 @@
 
 #ifdef SDL_HAPTIC_IOKIT
 
-#include "SDL_stdinc.h"
-#include "SDL_haptic.h"
 #include "../SDL_syshaptic.h"
-#include "SDL_joystick.h"
 #include "../../joystick/SDL_sysjoystick.h"     /* For the real SDL_Joystick */
 #include "../../joystick/darwin/SDL_iokitjoystick_c.h"    /* For joystick hwdata */
 #include "SDL_syshaptic_c.h"

src/haptic/dummy/SDL_syshaptic.c

@@ -22,7 +22,6 @@
 
 #if defined(SDL_HAPTIC_DUMMY) || defined(SDL_HAPTIC_DISABLED)
 
-#include "SDL_haptic.h"
 #include "../SDL_syshaptic.h"
 
 

src/haptic/linux/SDL_syshaptic.c

@@ -22,9 +22,7 @@
 
 #ifdef SDL_HAPTIC_LINUX
 
-#include "SDL_haptic.h"
 #include "../SDL_syshaptic.h"
-#include "SDL_joystick.h"
 #include "../../joystick/SDL_sysjoystick.h"     /* For the real SDL_Joystick */
 #include "../../joystick/linux/SDL_sysjoystick_c.h"     /* For joystick hwdata */
 #include "../../core/linux/SDL_evdev_capabilities.h"

src/haptic/windows/SDL_dinputhaptic.c

@@ -20,16 +20,10 @@
 */
 #include "../../SDL_internal.h"
 
-#include "SDL.h"
-#include "SDL_error.h"
-#include "SDL_haptic.h"
 #include "../SDL_syshaptic.h"
 
 #if SDL_HAPTIC_DINPUT
 
-#include "SDL_hints.h"
-#include "SDL_stdinc.h"
-#include "SDL_timer.h"
 #include "SDL_windowshaptic_c.h"
 #include "SDL_dinputhaptic_c.h"
 #include "../../joystick/windows/SDL_windowsjoystick_c.h"

src/haptic/windows/SDL_dinputhaptic_c.h

@@ -20,7 +20,6 @@
 */
 #include "../../SDL_internal.h"
 
-#include "SDL_haptic.h"
 #include "SDL_windowshaptic_c.h"
 
 /* Set up for C function definitions, even when using C++ */

src/haptic/windows/SDL_windowshaptic.c

@@ -22,13 +22,7 @@
 
 #if SDL_HAPTIC_DINPUT || SDL_HAPTIC_XINPUT
 
-#include "SDL_thread.h"
-#include "SDL_mutex.h"
-#include "SDL_timer.h"
-#include "SDL_hints.h"
-#include "SDL_haptic.h"
 #include "../SDL_syshaptic.h"
-#include "SDL_joystick.h"
 #include "../../joystick/SDL_sysjoystick.h"     /* For the real SDL_Joystick */
 #include "../../joystick/windows/SDL_windowsjoystick_c.h"      /* For joystick hwdata */
 #include "../../joystick/windows/SDL_xinputjoystick_c.h"      /* For xinput rumble */

src/haptic/windows/SDL_windowshaptic_c.h

@@ -23,7 +23,6 @@
 #ifndef SDL_windowshaptic_c_h_
 #define SDL_windowshaptic_c_h_
 
-#include "SDL_thread.h"
 #include "../SDL_syshaptic.h"
 #include "../../core/windows/SDL_directx.h"
 #include "../../core/windows/SDL_xinput.h"

src/haptic/windows/SDL_xinputhaptic.c

@@ -20,15 +20,10 @@
 */
 #include "../../SDL_internal.h"
 
-#include "SDL.h"
-#include "SDL_error.h"
-#include "SDL_haptic.h"
 #include "../SDL_syshaptic.h"
 
 #if SDL_HAPTIC_XINPUT
 
-#include "SDL_hints.h"
-#include "SDL_timer.h"
 #include "SDL_windowshaptic_c.h"
 #include "SDL_xinputhaptic_c.h"
 #include "../../core/windows/SDL_xinput.h"

src/haptic/windows/SDL_xinputhaptic_c.h

@@ -20,7 +20,6 @@
 */
 #include "../../SDL_internal.h"
 
-#include "SDL_haptic.h"
 #include "SDL_windowshaptic_c.h"
 
 /* Set up for C function definitions, even when using C++ */