v0.66.0 Release notes

-fixed an issue in the spawn system vs precise collision mask
-new crypt assets
-lava sound now correctly stops when leaving the area
-rearranged drawing of tilesets
-revised treestumps
-new asset dead tree
-added background music
-and the option to turn off the background music
-new asset explosive barrel
-improved cat ai, so she can now avoid conflicts
-new asset bookstand
-fixed a bug where the boss would duplicate or worse when going in an out of the area