Incorporate old-style ASCII property list parser

[brettz9]

I have an old-style ASCII property list parser at https://github.com/brettz9/macOS-defaults/blob/openwith/PlistParser.js#LC1 which I think makes more sense to be integrated here. (Are you still maintaining?)

Although it is recommended to use XML for input, output (such as from defaults read) may be in this old format. See https://github.com/brettz9/macOS-defaults/blob/openwith/test/parser.js#LC4 for tests.

[wsb9]

That's I was looking for, thanks!