* fcl-db: sql parser:
- support for variables in array access (e.g. myarray[:localvar] as happens in stored procs)
- rename TSQLSymbolLiteral to TSQLSymbolString to avoid confusion between enum and the TSQL*Literal classes
- Noted to do: array access via variables results in ElementIndex not being set. Need to verify what impact (if any) this has



git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@27918 3ad0048d-3df7-0310-abae-a5850022a9f2