v1.5 - Premium Update

CRITICAL BUG FIXES:
• DamageTracker memory leak - Boss damage data was not cleaned up correctly on death
• BossBar ConcurrentModificationException - Potential crash when updating players in radius
• SpawnerCooldownManager memory leak - Unbounded memory growth with spawners
• DamageTracker thread-safety - Switched to ConcurrentHashMap to prevent race conditions

PERFORMANCE IMPROVEMENTS:
• ConfigManager caching - Config reads optimized (no parsing at runtime)
• ColorUtils optimized with StringBuilder
• Removed MythicDamageEvent listener that did nothing (reduced event overhead)

STABILITY IMPROVEMENTS:
• Null-safety across all listeners and managers
• Configurable radius per announcement type (spawn, death, despawn)
• Try-catch around reward command execution
• Correct shutdown order to prevent errors on disable

UX IMPROVEMENTS:
• Smart tab-completion for /mmaddon
• /mmaddon reload shows execution time
• /mmaddon info expanded with more details

NEW CONFIG OPTIONS:
• - Radius for spawn announcements (default: 100)
• - Radius for death announcements (default: 100)

100% backward compatible. Existing config files will automatically get the new default values.