Flawed collision detection

Due to a coding oversight, a hitscan attack will pass through its target if it does not enter the block in which the center of the target Thing is located.

Another issue is that a monster's cross-section, rather than its bounding box, is used to check for hitscan impacts; this makes melee attacks unlikely to hit very wide monsters like the Mancubus, Spider Mastermind, and Arachnotron.