fix sound emulation in doom; update to pause sound when doom is paused; update to have menu / game perform better (doom) by adding appropriate sleeps in the main loop and audio task; update pool to be able to query if pointer is in pool or not

Author: finger563

components/doom/include/doom.hpp

@@ -7,6 +7,9 @@
 
 void reset_doom();
 void init_doom(const std::string& rom_filename, uint8_t *romdata, size_t rom_data_size);
+void doom_init_shared_memory();
+void pause_doom_tasks();
+void resume_doom_tasks();
 void load_doom(int save_slot);
 void save_doom(int save_slot);
 void run_doom_rom();

components/doom/prboom/z_zone.c

@@ -179,12 +179,18 @@ void Z_Close(void)
 
 static void* my_malloc(size_t size)
 {
-  return pool_alloc(size);
+  void * ptr = pool_alloc(size);
+  if (!ptr) ptr = (malloc)(size);
+  return ptr;
 }
 
 static void my_free(void* p)
 {
-  pool_free(p);
+  if (pool_contains(p)) {
+    pool_free(p);
+  } else {
+    (free)(p);
+  }
 }
 
 void Z_Init(void)