This commit adds a new ICBM tower type with distinct visual effects and attack behavior. Key changes include:
- Added ICBM tower configuration with 3 levels, damage, range, and AOE properties
- Implemented custom animation system for tower firing sequences
- Created specialized icbmAttackTarget method with missile launch and explosion effects
- Updated tower rendering logic to handle ICBM's unique sprite setup (base + top)
- Modified enemy targeting logic to exclude ICBM from normal rotation behavior
- Added new animation definitions for ICBM explosion effects
- Adjusted interface manager to display correct sprites for ICBM tower in menus
The ICBM tower features a missile launch animation, AOE damage on impact, and explosion visual effects that distinguish it from other tower types.
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