Update 0.21 - Changes for the Steam Tower Defense Fest

Hi everyone, This update contains some QoL changes and bug fixes. [list] [*]Changed the description of the training map. [*]Improved path finding speed. [*]Enemies can no longer "sneak" into your base by moving diagonally between buildings. [*]A rectangle now appears on the wall's base while you're building. This is to make it easier to see the area covered by the wall. [*]Fixed a bug that happened when clicking on some gems in the Status Effect Wiki. [*]Fixed a rare bug that happened when workers attempted to return to the town hall. [*]Display a warning after a unit is trained and the population cap is reached. [*]Display a warning when woodcutters or stone miners have no resources near their buildings. [*]Display a warning when the first enemy is hit. [*]Made the cursor smaller. [/list] I hope you enjoy the Tower Defense Fest while we get ready to announce the game's exit from Early Access. Till later, André