Add recognition of SQL parameters

[bednic]

Please can you add recognition for syntax like "SELECT * FROM table WHERE a = :b" where b is binding parameter to PDO.
Here is solution:
ExpressionListProcessor.php(366) -> add case when is qual to ":";
ExpressionType.php -> add new constant *const PARAM = "param"; *
which means it's binding parameter.

Thanks a lot. Good work btw ;)

[greenlion]

Will do ASAP.