Major change: Optimization overhaul

• Optimized skeletal mesh performance
• Optimized widget rendering
• Optimized particle effect performance
• Optimized widget update performance
• Optimized destructible mesh performance

Minor changes:

• Fixed a bug causing Cult Leader to disappear, softlocking the game
• Fixed a bug which caused volcano tower to be upgraded
• Fixed a bug which caused the game to crash when gaining a certain achievement
• More minor bug fixes