v1.2.20 added gallery rotunda photos (2021-12-12)

Gallery Rotunda updates:
• Added a photo of the gallery rotunda, which transitions to night time as more galleries are viewed.
• The night gallery shows the path to the additional exhibit (large opening in floor to basement).
•This was my initial plan, but I left it out since didn't have time during the game jam.
•Thanks to Michael from "the proper people" for allowing use of his photo of a ruined rotunda

Also did some audio updates:
• Fixed a bug with the serpent music, as the original didn't export quite right and was missing the first beat in some instruments.
• Strengthened audio implementation to avoid overlaps if you push the game.
• The madness music includes extra (futile) clicks.