Add $is_a(<name>, <target-type>), $filter[_out](<names>, <target-types>) functions

$is_a() returns true if the <name>'s target type is-a <target-type>. Note
that this is a dynamic type check that takes into account target type
inheritance.

$filter[_out]() return names with target types which are-a (filter) or
not are-a (filter_out) one of <target-types>.

In particular, these functions are useful for filtering prerequisite
targets ($<) in ad hoc recipes and rules.

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