Support named parameters

[madhuracj]

phpMyAdmin support parameter binding with named parameters in SQL editor.
For example, you can write a query like
INSERT INTO `person` (`firstname`, `lastname`, `email`) VALUES (:firstname, :lastname, :email);
and phpMyAdmin will allow specifying values for the parameters.

However, the parser does not support this and triggers syntax error warnings on the editor. It would be nice to have the sql-parser support this feature.