Logging with loguru (#708)

* logging

* requirements

* add loguru dependency

* restore it

* add loguru

* set log level in .env file

* remove service fee print

* set log level

* more logging

* more logging

* more logging

* pyament.checking_id

* fix

lnbits/core/views/public_api.py

@@ -7,6 +7,8 @@ from fastapi import HTTPException
 from starlette.requests import Request
 from starlette.responses import HTMLResponse
 
+from loguru import logger
+
 from lnbits import bolt11
 
 from .. import core_app
@@ -45,7 +47,7 @@ async def api_public_payment_longpolling(payment_hash):
 
     payment_queue = asyncio.Queue(0)
 
-    print("adding standalone invoice listener", payment_hash, payment_queue)
+    logger.debug("adding standalone invoice listener", payment_hash, payment_queue)
     api_invoice_listeners.append(payment_queue)
 
     response = None