Werk #7333: Introduce predefined conditions for rulesets

In the rule-based configuration of Check_MK ("Host & Service Parameters" and "Manual Checks") it often happens that rules with the same conditions have to be created in different rule chains. With a larger number of rules, this quickly becomes confusing.

To improve this situation we have now added a feature called "Predefined conditions". The idea is to preconfigure conditions in a central place, to which you can later refer in the individual rule chains. A predefined condition currently always consists of a full set of conditions (folder, tags, host specification, service specification). A rule can either use explicit conditions, as before, or refer to a predefined condition now.

You access the predefined conditions via a context button from the pages on which you manage your rule chains.

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