Syntax/Pascal: Support multiline strings

[baka0815]

Delphi introduced multiline strings in version 12. They start with ''' and end with ``'''```.

Before:

After:

[sdottaka]

Thank you for the PR. I’ve merged it.
By the way, you're currently using COOKIE_BLOCK_STYLE, but this constant represents a block within a <style> tag in an HTML file. I plan to replace it with a more appropriate name later.

[sdottaka]

I reverted it because it was treated as a multi-line string in the following cases. Could you fix this issue and submit the PR again?

  a = AnsiChar('''');

[baka0815]

@sdottaka I can take a look at it again.

Is there a better constant thant COOKIE_BLOCK_STYLE? Should I introduce a new one?
Is the rest of the code "ok" or is there anything else I should change while I'm at it?

[sdottaka]

I think it's better to use COOKIE_RAWSTRING instead of COOKIE_BLOCK_STYLE. I'll check later if there are any other issues.