- Items class hierarchy.
- Inventory class.
- CharacterStats class.
- Applies modifiers to character's stats.

- Adjusting the knockback to be reasonable level.
- Rewrite movement code to use acceleration.

- TakeDamage() now takes new AttackStats object.

- OnColide for projectiles.
- Layers to prevent collision between player and bullets.
- Commented out some unused print statements.
- Added hp handling to EnemyController.

- Projectiles follow mouse position.
- Player sprite follows mouse position.
- Cooldown on attacks.
- Can attack with left-click.