Werk #8579: Generalize Livestatus filter operators

Previously, some filter operator did not work for numbers or had only a special meaning with certain columns. This has been generalized in a uniform way, so all operators work for numbers now, too.

The operators ~, =~, and ~~ interpret numbers as bit sets, and have the following meaning:

• x ~ y means: x is a superset of y
• x =~ y means: x is a subset of y
• x ~~ y means: x contains at least one element of y

This is consistent with the way attribute list columns work and makes the Livestatus semantics more regular.

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