Added per-invite notifications for expiry and user creation

Notifications must be enabled in settings; they can then be
toggled in the dropdown menu of each invite.

jellyfin_accounts/invite_daemon.py

@@ -0,0 +1,42 @@
+from threading import Timer
+import time
+from jellyfin_accounts import config, data_store
+from jellyfin_accounts.web_api import checkInvite
+
+
+class Repeat:
+    def __init__(self, interval, function, *args, **kwargs):
+        self._timer = None
+        self.interval = interval
+        self.function = function
+        self.args = args
+        self.kwargs = kwargs
+        self.is_running = False
+        self.next_call = time.time()
+        self.start()
+
+    def _run(self):
+        self.is_running = False
+        self.start()
+        self.function(*self.args, **self.kwargs)
+
+    def start(self):
+        if not self.is_running:
+            self.next_call += self.interval
+            self._timer = Timer(self.next_call - time.time(), self._run)
+            self._timer.start()
+            self.is_running = True
+
+    def stop(self):
+        self._timer.cancel()
+        self.is_running = False
+
+
+def checkInvites():
+    invites = dict(data_store.invites)
+    # checkInvite already loops over everything, no point running it multiple times.
+    checkInvite(list(invites.keys())[0])
+
+
+if config.getboolean("notifications", "enabled"):
+    inviteDaemon = Repeat(60, checkInvites)