Patch v0.99.12

Fixed a bug where the abandoned mine could not be clicked.

Resolved an issue where empty save files were incorrectly displayed as deleted.

Fixed a bug where summoned caravans would disappear after loading a save file.

Fixed an issue in the map editor where invalid saves were allowed.

Fixed a bug in Level 4-3 where the monster wave in June was incorrect.

Resolved an issue where monster spawn points were abnormal after loading a save file.