Removed temporary memory from the API

It was intended to make the API easier to use, but various automatic garbage collection all had flaws, and making the application periodically clean up temporary memory added cognitive load to using the API, and in many cases was it was difficult to restructure threaded code to handle this.

So, we're largely going back to the original system, where the API returns allocated results and you free them.

In addition, to solve the problems we originally wanted temporary memory for:
* Short strings with a finite count, like device names, get stored in a per-thread string pool.
* Events continue to use temporary memory internally, which is cleaned up on the next event processing cycle.

include/SDL3/SDL_storage.h

@@ -410,14 +410,14 @@ extern SDL_DECLSPEC Uint64 SDLCALL SDL_GetStorageSpaceRemaining(SDL_Storage *sto
  *              array. Can be NULL.
  * \returns an array of strings on success or NULL on failure; call
  *          SDL_GetError() for more information. The caller should pass the
- *          returned pointer to SDL_free when done with it.
+ *          returned pointer to SDL_free when done with it. This is a single allocation that should be freed with SDL_free() when it is no longer needed.
  *
  * \threadsafety It is safe to call this function from any thread, assuming
  *               the `storage` object is thread-safe.
  *
  * \since This function is available since SDL 3.0.0.
  */
-extern SDL_DECLSPEC_TEMP const char * const * SDLCALL SDL_GlobStorageDirectory(SDL_Storage *storage, const char *path, const char *pattern, SDL_GlobFlags flags, int *count);
+extern SDL_DECLSPEC_FREE char ** SDLCALL SDL_GlobStorageDirectory(SDL_Storage *storage, const char *path, const char *pattern, SDL_GlobFlags flags, int *count);
 
 /* Ends C function definitions when using C++ */
 #ifdef __cplusplus