Named parameter binding support

Hi all,

I've attached a patch that adds support for named parameter binding when
calling procedures or functions. Applications can use SQLSetDescField to
specify parameter names, as described at
https://docs.microsoft.com/en-us/sql/odbc/reference/develop-app/binding-parameters-by-name-named-parameters

Notes:
* Works for input and output parameters
* Regression tests enhanced to include binding parameters by name

Regards,

Adrian Grucza
Technical Lead
Tel: +61390185800
adrian(dot)grucza(at)iress(dot)com
www.iress.com
Level 16, 385 Bourke Street,
Melbourne, Victoria, 3000
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