Support full SQL standard character string literal syntax
---------------------------------------------------------

                 Key: CORE-5312
                 URL: http://tracker.firebirdsql.org/browse/CORE-5312
             Project: Firebird Core
          Issue Type: Improvement
          Components: Engine
            Reporter: Mark Rotteveel


Currently Firebird supports a limited form of the character string literal, 
please add support for the full syntax defined in the SQL standard.

In SQL:2011 character string literal is defined as: 

<character string literal> ::=
  [ <introducer><character set specification> ]
      <quote> [ <character representation>... ] <quote>
      [ { <separator> <quote> [ <character representation>... ] <quote> }... ]

This means the following, currently unsupported, string literals should be 
allowed as well:

* 'ab' 'cd'
* 'ab'/*comment*/'cd'
* 'ab' -- comment and newline
'cd
* 'ab'
'cd'

etc

See also CORE-5311 for binary string literal

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