Added Gold Coin and Gold Coin Effect graphics

-Added padding for Hurtboxes to make enemies easier to hit
-Reduced the AttackSpeed of the Sword and Warhammer from 500 to 100 and from 750 to 300, respectively
  -This change allows us to make the game faster paced without punishing the player too hard for missing an enemy
Created the EnemySpawning Class

-Moved the enemy spawning from Level.cs to EnemySpawning.cs for better organization
-Added an instance of the EnemySpawning class to Level
Merge branch 'GoldGraphics'
Merge remote-tracking branch 'origin/ContinueEnemySpawning'

Conflicts:
	Defend Your Castle/Defend Your Castle/Level.cs
Completely fixed merge conflicts with origin/GoldGraphics and origin/ContinueEnemySpawning