add new module: help (allows to get manual pages for commands)

modules/help/db/hardsub.txt

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+Usage: !hardsub [event_name]
+
+Permanently subscribes to [event_name]. If blank, uses "default".
+To unsubscribe, use !hardunsub
+For one-time subscriptions, use !sub

modules/help/db/hardunsub.txt

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+Usage: !hardunsub [event_name]
+
+Remove permanent subscription to [event_name]. If blank, uses "default".
+To remove one-time subscription, use !unsub
+To add permanent subscription, use !hardsub

modules/help/db/schedule-ctl.txt

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+Usage:
+    !schedule-ctl list                  - see all settings
+    !schedule-ctl get <setting>         - see specific personal setting
+    !schedule-ctl set <setting> <value> - change <setting> to <value>
+    !schedule-ctl clear <setting>       - restore <setting> to default value

modules/help/db/sub.txt

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+Usage: !sub [event_name]
+
+Soft-subscribes to [event_name]. If black, uses "default".
+If you want to remove soft substription, use !unsub
+
+Soft subscription is automatically removed after the event is triggered once.
+If you want to subscribe permanently, use !hardsub

modules/help/db/unsub.txt

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+Usage: !unsub [event_name]
+
+Removes one-time subscription to [event_name]. If blank, uses "default".
+Does not affect hard subscriptions. To remove hard subscription, use !hardunsub
+To add one-time supscription, use !sub