Alpha Hotfix #018

1.0.6.5777

Game patch
- Snapping has been added when you build your storage.
- Minimum condition increased to 20.
- Legend difficulty zombies become stronger and the number of zombies increases.

Optimization
- Improved performance when there are many animal corpse

Bugfix
- The problem that opens storage box after another interaction.
- tree-invisible problem in the tree plantation of client.
- We fixed the multiplayer sound bug.