Issue:
Playing the Prologue mission of the Orthalm campaign starts with an error saying the unit type Recruit has been disabled. The mission can be played after closing the error message.

Cause:
Recruits are disabled but haven't been removed from the campaign mission.

Solution:
Updating the mission by removing Recruits and replacing them with other units to man the towers. (This will have

Right now there's almost no documentation on how engine works, need to describe:

• Object and component model (i.e. Scene, SceneObject, Component classes, etc.)
• Level, object and scene instances loading and processing
• Graphics, Lighting, Animation, Particle Effects and Audio, at least short summary
• Configuration file processing, user data
• Input Manager, Controller Context, etc.
• Scr

Should not programmatically rotate the sprites for bullets.

In this case, probably fine to not change the sprite based on the angle. But in general, for other sprite types, should not create a new copy of the sprite for each entity. Instead, we should maintain a static cache of sprites, and allow each entity to have a reference to one of these sprites.