match: simplify brittle predicate construction
In match.__init__(), we create the matchfn predicate by and-ing
together the individual predicates for includes, excludes (negated)
and patterns. Instead of the current set of nested if/else blocks, we
can simplify by adding the predicates to a list and defining the
overall predicate in a generic way based on the components. We can
still optimize it for the 0-length and 1-length cases. This way, there
is no combinatorial explosion to deal with if new component predicates
are added, and there is less risk of getting the overall predicate
wrong.
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