FIX: issues and improvements to frontend, add lnurlp/lnurladdress, remove split by tag feature (#4)

* deinitialize task
* rework of frontend
* add lnurl and lightningaddresses
* substract fee_reserve from external split, for potential routing fee, add a warning to ui

__init__.py

@@ -1,4 +1,5 @@
 import asyncio
+from typing import List
 
 from fastapi import APIRouter
 from fastapi.staticfiles import StaticFiles
@@ -9,6 +10,8 @@ from lnbits.tasks import catch_everything_and_restart
 
 db = Database("ext_splitpayments")
 
+scheduled_tasks: List[asyncio.Task] = []
+
 splitpayments_static_files = [
     {
         "path": "/splitpayments/static",
@@ -32,4 +35,5 @@ from .views_api import *  # noqa: F401,F403
 
 def splitpayments_start():
     loop = asyncio.get_event_loop()
-    loop.create_task(catch_everything_and_restart(wait_for_paid_invoices))
+    task = loop.create_task(catch_everything_and_restart(wait_for_paid_invoices))
+    scheduled_tasks.append(task)