Add method to MultiInputDialog to return input fields

[roygbyte]

In order to update the field's text value after it's been rendered, the input field needs to be returned, and not just the text value.

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This change is 

[NiLuJe]

Not familiar with the widget, but wouldn't it make more sense to make those fugly-ass module-locals you're trying to access instance members, and just use a getter method?

[roygbyte]

Do you mean like, make input_field an instance member, as in: self.input_field? If so... yeah, probably. :)

In context, this is how I'm using the new method.

   dialog:getInputFields()[2]:setText(path)

It seems weird to me that the getFields method doesn't return the widgets to begin with. Oh well.

[zwim]

I want to raise the question to the use case here too.

If there is no use case, it is dead code.

[roygbyte]

Use case is the Newsdownloader replacement, again.

I might be able to avoid having to use this patch, though... and might retract this :)

[roygbyte]

Ok! I do want this :)

@NiLuJe how are you suggesting I revise the code? Make input_field an instance member like as in self.input_field?

[NiLuJe]

How are you suggesting I revise the code? Make input_field an instance member like as in self.input_field?

Unless there was a technical reason for the weird module local, yep!

[NiLuJe]

Superseded by #9586 (:getRawFields()) ;).