implement a functioning scheduler, get rid of threads

pgbot

@@ -1,5 +1,6 @@
 #!/usr/bin/env python3
 
+import asyncio
 import sys
 import threading
 
@@ -8,9 +9,9 @@ import yaml
 
 import pgbotlib.dbstuff
 import pgbotlib.commands
+import pgbotlib.cron
 import pgbotlib.misc
 import pgbotlib.response
-import pgbotlib.sched
 
 
 def init(args: list) -> tuple:
@@ -38,12 +39,6 @@ def main():
     commander = pgbotlib.commands.Commander(config, client, config['admins'],
                                             db_conn, namegen, responder)
 
-    sched_thread = threading.Thread(
-            target=pgbotlib.sched.spawn_scheduler,
-            args=(config, client, responder),
-            daemon=True)
-    sched_thread.start()
-
     @client.on(telethon.events.NewMessage())
     async def handle_new_message(event):
         if event.message.text.startswith('/'):
@@ -51,7 +46,10 @@ def main():
         else:
             await responder.respond(event)
 
-    client.run_until_disconnected()
+    cron = pgbotlib.cron.Cron(config, client, responder)
+    cron.plan()
+    loop = asyncio.get_event_loop()
+    loop.run_forever()
 
 
 if __name__ == '__main__':