funmatch - match glob-like pattern against string

* pattern is a simplified glob-like pattern [1]
* string is typically a filename (no directory portions)

For example:

  (funmatch "*.janet" "test.janet")
  # =>
  true

Patterns

* * - zero or more characters
* ? - one character
* [x-y] - one character in the range x <= y
* [!x-y] - one character not in the range x <= y
* [xyz] - one character in the set x, y, ..., z
* [!xyz] - one character not in the set x, y, ..., z

Implementation

The general idea is to:

1. Parse glob-like pattern into pieces (parse-pattern)
2. Create peg from parsed pieces (make-peg)
3. Apply peg/match to a string using the generated peg

Keywords: glob, fnmatch, wildmat

References

* fnmatch(3)
* glob(7)
* https://en.wikipedia.org/wiki/Glob_(programming)

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[1] Various behavior and constructs are not supported,
    e.g. leading dots in names are not treated
    specially, sets and ranges must be expressed
    separately, no escape characters, etc.