Bump version to 2.1

Major improvements in v2.1:
- Fixed console settings matching to use DeviceName and template NAME fields
- Proper URL encoding for rules (handles # and = characters)
- Fixed rule enabling (Rule1 ON vs Rule1 4)
- Fixed MQTT FullTopic %20 prefix issue
- Added single-device diff (--diff DEVICE)
- Improved button timing (SetOption32=8 for 0.8s hold)
- Created Plug profile separate from switch settings
- Fixed SetOption verification and disabled to prevent device overload
- Added delays and retry logic for reliable rule enabling

TasmotaManager.py

@@ -315,7 +315,7 @@ def main():
 
     # Setup logging
     logger = setup_logging(args.debug)
-    logger.info("TasmotaManager v2.0 starting")
+    logger.info("TasmotaManager v2.1 starting")
 
     # Ensure data directory exists
     ensure_data_directory()