Allow to specify hint text for choice options

[nmandrescu]

Sometime choice options need an extra clarification to the end users. We would like to keep the option text short, and add a longer text that clarifies the option meaning. Unfortunately for now we have to define long option text to include the clarification.

Please add the possibility to configure choice option hint in the choice list of option.

list_name	name	label::English	hint::English
choices_example	optA	Option A	This is a longer description of the option A
choices_example	optB	Option B	This is a longer description of the option B