Padre::Wx::ComboBox::History is a normal Wx ComboBox widget, but enhanced
with the ability to remember previously entered values and present the
previous values as options the next time it is used.
This type of input memory is fairly common in dialog boxes and other task
inputs. The parameters are provided to the history box in a form compatible
with an ordinary Wx::ComboBox to simplify integration with GUI generators
such as Padre::Plugin::FormBuilder.
The options hash should contain exactly one value, which should be the
key string for the history table. This can be a simple name, allowing the
sharing of remembered history across several different dialogs.
The value can be defined literally, or will be pulled from the most
recent history entry if it set to the null string.