[TYPO3-mvc] Improve handling of bound properties in checkbox, radio and select ViewHelpers

[Franz Koch]

Hey Bastian,

> @all please have a look at the attached images at
> http://forge.typo3.org/issues/9214 (or download the Excel file that
> contains the matrices on 3 sheets)

I had a quick look, and by reading the exception messaged I noticed, 
that they are not of too much help for debugging, as the name of the 
property triggering the exception is missing in all cases - as well as 
the viewHelper type. So I think the name of the property should be part 
of the messages as well as the viewHelper/form field type.

So something like this:
"Property XY could not be rendered as checkbox. Reason: a checkbox can 
only be bound to properties of type boolean or array/Traversable"

instead of:
"property can only be bound to values of type boolean or array/Traversable"

-- 
kind regards,
Franz Koch