Progressive Difficulty

Added several new modifiers

• Gaze Modifiers:  Debuff the player with an effect while a mob with this modifier is targeting the player, and the mob can see the player.
  • Slowness
  • Mining Fatigue
  • Hunger
  • Weakness
• Vampiric Modifier:  Returns a fraction of damage done as health to the mob
• Fire Aspect Modifier:  Sets the player on fire on hit
• Regeneration Modifier:  Mobs regain health over time