Made enemy bullets move in the forward vector in BulletHelper.cs .  Moved a bunch of scripts into folders for better organization.  Categorized enemy tag collisions in PlayerBulletHelper.cs. Added in enemy logic for CircleShot.cs, DoubleShot.cs, SingleShot.cs.  Imported in Zack's models.  Made the boss's health bar which appears at the bottom of the screen with BossHealthBar.cs and ModifyBossHealthBar.cs.  Created logic for boss parts with BossPartLogic.cs.  Allowed enemy turrets to track the player with EnemyTurretLogic.cs.