- Added method for healing characters.
- Added calls to trigger some item events.

- Added code to trigger the events.
- Added Actor prop to AttackStats so we can see where the damage came from.

- Added code to Inventory to inform owner of conditional items.
- Added code to Character to add/remove listeners.

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

- Also removed depricated method.

- TakeDamage() now takes new AttackStats object.

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