Clean up.
Fix position of the terminating decimal last digit.
Explain why a period is used for the decimal mark.
Remove support for built-in string interpolation.
Remove support for quasi-quote and unquote-splicing.
Remove meta-data support.

- Complicates things and is not strictly required.
- "Hides" data, which can be unexpected.
- Makes the language easier to learn.
Clean up.
Rename String to Text because it's less ambiguous.
Avoid unnecessary contractions.