Todo (but no promises)
----------------------

- Look into freeing sound from memory when switching back and forth
  between the book room and another room. The "sound_discard()" and 
  "sound_enable()" functions do not work on LaterGM+ENIGMA. At the 
  moment, it seems as though "sound_add()" keeps adding-up when you 
  switch back and forth between rooms. However, it does free-up memory 
  when you close the program/game so it could be worse.

- Maybe think about adding a variable in which true/false determines 
  whether or not a bookmark will be randomized between pages over a 
  given time, simulating that someone else has been reading the book, 
  especially if the environment it is found is in someone else's home or
  a shop.
