Werk #7059: Add an option to reduce the logging in the notify.log

By default two lines are added for every notification rule in the notify.log. They contain a short description of the rule and information why the rule does or does not match. In setups with a large number of notification rules this may result in up to hundreds of lines in the notify.log for every incoming raw notification. To optionally reduce the amount of logging this werk introduces a new log level that only adds lines for matching rules. The new option can be selected in the Global Settings under "Notification log level". Be aware that with this option the notify.log does not conain information about rules which do not match which makes it much harder to analyze why a certain rule did not match retrospectively.

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