Fixed several fairly serious bugs!

● Fixed a bug that caused player-built structures, storage boxes, workbenches, walls, and other objects to unexpectedly collapse and disappear.

● Completely fixed an occasional bug where some "invincible small trees, rocks, and stumps" would appear.

● Fixed a bug in the tree system that could leave behind an unfellable tree after chopping one down.

● Fixed a bug where setting the "zombie respawn interval" to 0 would instead make zombies spawn infinitely.

● Fixed a bug where the scope crosshair would stretch.

● Improved the alignment of the "building system" — it's now much easier to use than before.

● Fixed a bug where the "death backpack" sometimes failed to spawn.

● Added an "in-game Debug log" system for mod makers, making the debugging process much more convenient.