[*][editorial] Unquote delimiters in value definitions

[cdoublev]

This PR removes the quotes around : / ) in value definitions.

Since eab6ac4, the related text of CSS V&U is:

6. Delimiters, which represent their corresponding tokens. Slashes (/), commas (,), colons (:), semicolons (;), parentheses (( and )), and braces ({ and }) are written literally. Other delimiters must be written enclosed in single quotes (such as '+').

In this paragraph, whether they can be or they must be written literally is ambiguous.

None are tokenized as <delim-token> but as their own token, except /. They are delimiters, I think, and I guess these tokens only exist for convenience. But a "dumb" CSS value definition parser may interpret ')' as a <delim-token> whose value is ), whereas such token cannot exist.

This change would also be appreciated to have simpler implementation of such parsers. MediaQueries and Selectors both define a "general" functional notation: the former with ), the second with ')'.