Patch v0.99.21

[list] [*] Fixed a bug where newly created maps sometimes had incorrect map sizes. [*] Fixed a bug where movable buildings could not be placed at map boundaries. [*] Fixed incorrect textures for the Stone Cannon. [*] Added validation for spawn points in the map editor to reduce incorrect spawn point placement. [*] Fixed a bug where the Crystal Tower would fire multiple missiles after upgrading. [*] Fixed incorrect charge bonuses for Orc Cavalry. [*] High-quality blueprints now have a small chance to add a card with 1 usage count. [*] Taverns no longer have a minimum food requirement for harvesting gold. [*] Updated the assets for Spearmen and Spear Guards, thanks to the help of a talented group member. [*] Fixed incorrect duration for the Strong Paralysis effect. [*] Enhanced the upgrade effects of Rolling Logs. [*] Optimized code to reduce lag. [*] Fixed a bug where custom maps could cause errors in endless mode due to monster spawning. [*] Fixed a bug where walls had incorrect health after upgrading. [/list]