MESSAGE_TIMEOUT option

Mert Kureşrequested to merge
MertKures/journalctl-desktop-notification:master into master

This PR adds an option called MESSAGE_TIMEOUT preventing alerts staying indefinitely until user clicks them. Only works with dunst since notify-osd ignores -t (expire_timeout) argument.

https://wiki.ubuntu.com/NotifyOSD#org.freedesktop.Notifications.Notify

https://bugs.launchpad.net/ubuntu/+source/notify-osd/+bug/390508

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