New items system.

• Items class hierarchy.
• Inventory class.
• CharacterStats class.
• Applies modifiers to character's stats.
• Generalized the EnemyController class.

MrBigsock/Assets/Code/Core/CharacterStats.cs

+using System.Collections;
+using System;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.InputSystem;
+
+
+namespace BigSock {
+
+	/*
+		class represents the stats of a character.
+	*/
+	public class CharacterStats : ICharacterStats {
+		/*
+			The hp of the character.
+		*/
+		public float MaxHP { get; set; }
+
+		/*
+			The damage of the character.
+		*/
+		public float Damage { get; set; }
+
+		/*
+			The movement speed of the character.
+		*/
+		public float MoveSpeed { get; set; }
+
+		/*
+			The knockback of the character.
+		*/
+		public float Knockback { get; set; }
+
+		/*
+			The range of the character.
+		*/
+		public float Range { get; set; }
+
+		/*
+			The attack speed of the character.
+		*/
+		public float AttackSpeed { get; set; }
+
+	}
+}
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