Changes
-Improved blue lever spawn location selection for tomb variation #6

Fixes:
-Fixed an issue in which books could no longer be picked up once placed in the Library puzzle
-Fixed an issue in which books could overlap inside the same bookshelf slot in the Library puzzle
-Fixed a potential issue in which the ushabti chest would not lower for all players after the Constellation puzzle was solved
-Fixed an issue where the Circular Rune puzzle was able to be solved before the spike ceiling's descent
-Fixed an issue in which the Animal Memory puzzle's audio played off-center for one of the buttons
-Fixed a physics issue with drawers in the lobby area