Revised DateTimes, strings, floats and errors.

Hey, I reworked the syntax recognition a little bit, because serveral things did not work with your file.
At first I tried it on my own, but then I saw that you already made corrections to 'lmno's file. So I let me get inspired by yours.
As a consequence I used the YAML format instead of JSON and my file has many differences to yours, but it works fine.
Please test it with the added example and see the improvements :) if something does not work, feel free to contact me.

Kind regards