Use SDL_bool where appropriate in SDL events

This involved changing button state from Uint8 to SDL_bool, and made SDL_PRESSED and SDL_RELEASED unnecessary.

Fixes https://github.com/libsdl-org/SDL/issues/10069

test/testautomation_keyboard.c

@@ -18,7 +18,7 @@
 static int SDLCALL keyboard_getKeyboardState(void *arg)
 {
     int numkeys;
-    const Uint8 *state;
+    const SDL_bool *state;
 
     /* Case where numkeys pointer is NULL */
     state = SDL_GetKeyboardState(NULL);