fix (schedule): Setting tweaks and more bugfixes.

Add the schedule dashboard to the config dashboard.
Move the schedule cost to the second page.
Allow categories to be selected for the session room.

Fix an issue where blacklist role would be checked with no guild data.
Fix typos in session unloading.
Delay session notification.
More logging.

src/modules/config/dashboard.py

@@ -16,6 +16,7 @@ from modules.ranks.ui.config import RankDashboard
 from modules.pomodoro.settingui import TimerDashboard
 from modules.rooms.settingui import RoomDashboard
 from babel.settingui import LocaleDashboard
+from modules.schedule.ui.settingui import ScheduleDashboard
 # from modules.statistics.settings import StatisticsConfigUI
 
 from . import babel, logger
@@ -31,7 +32,8 @@ class GuildDashboard(BasePager):
     pages = [
         (LocaleDashboard, EconomyDashboard, TasklistDashboard),
         (VoiceTrackerDashboard, TextTrackerDashboard, ),
-        (RankDashboard, TimerDashboard, RoomDashboard, )
+        (RankDashboard, TimerDashboard, RoomDashboard, ),
+        (ScheduleDashboard,),
     ]
 
     def __init__(self, bot: LionBot, guild: discord.Guild, callerid: int, channelid: int, **kwargs):