E1S12: More improvements to the Queen introduction sequence

 * Refactored some code so the Queen's location is stored in a single
   variable instead of manually specified all over the place.
 * Made it so a first living unit under the player's control faces
   towards the Queen's spawn point before speaking, if available.
 * Made it so all other player-controlled units face towards the Queen's
   spawn point just as she appears.
E1S13: Disable music
E1S13: Add hive ambience sound sources
E1S13: Timing adjustments
E1S13: Add SFX fade-out at the end, delay endlevel, apply shroud, etc.