Support tokenizing `.` wildcard operator.

* src/paca.mjs
  (isTransition): Add new function as an improved version of the raw
    usage of `stateTransitionOperators`, equivalent to `isAnchor()` and
    `isOperator()`.
  (operatorChars, isOperator): Add new static set `operatorChars` as
    backing data of `isOperator()`, instead of ad-hoc conditional in its
    implementation.  Also now add the `.` character as an operator by
    including it in the `operatorChars` set.
  (tokenizeRegexStep): Use the new `isTransition()` function instead of
    checking the set directly.  Also tweak ternary to fit in 80 columns.
  (PRECEDENCE): Add `.` operator with lowest precedence, as it is not
    really operating on anything, and is instead a target to be operated
    on.
* tests/paca.mjs
  (test_isTransition): Add obligatory test cases.
  (test_isOperator): Include test case for `.` wildcard operator.

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