Support searching in the NFA using the metacharacters.

* src/paca.mjs
  (searchNFAStep): Now instead of just checking if the node has a
    transition via a character literal directly, we also check (via the
    `performTransition()` function) if a metacharacter interpretation
    allows a transition to happen.
  (intepretMetacharacter): Add function that "executes" the action
    representation in the "meta" attribute of the object, when present.
    It is somewhat ad-hoc now, doing checks that implicitly only exist
    for "." or "class" metacharacters, but OK for now, given the
    possibilities.
  (performTransition): Do the fallback to `interpretMetacharacter()`,
    giving it an empty object when the node doesn't have the "meta"
    attribute.
* tests/paca.mjs (test_{interpretMetacharacter,performTransition): Add
  routine test implementation.

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