Implement duck item drop system and remove all emojis

Duck Item Drop System:
- Added configurable drop rates per duck type (15%/25%/50%)
- Created weighted drop tables for different items
- Normal ducks: basic items (bullets, magazines, gun brush, sand)
- Fast ducks: useful items including bucket of water
- Golden ducks: rare items (bread, insurance, gun buyback, dry clothes)
- Items automatically added to player inventory
- Added drop notification messages for each duck type
- Integrated seamlessly with existing combat mechanics

Emoji Removal:
- Removed all emojis from source code files
- Updated logging system to use clean text prefixes
- Replaced trophy/medal emojis with #1/#2/#3 rankings
- Updated README.md to remove all emojis
- Professional clean appearance throughout codebase

duckhunt.py

@@ -25,7 +25,7 @@ def main():
             config = json.load(f)
         
         bot = DuckHuntBot(config)
-        bot.logger.info("🦆 Starting DuckHunt Bot...")
+        bot.logger.info("Starting DuckHunt Bot...")
         
         # Run the bot
         asyncio.run(bot.run())