Handle extra field updates on report inspect page

We want to make sure the extra metadata stored on a problem is kept in sync with
the requirements of the category the report is in. Thus, if a report is moved to
a category that collects extra metadata then the appropriate input fields should
be shown so the inspector can enter the data.

This commit shows the category extra HTML elements for every selectable category
on the inspector page hiding those that don't apply to the selected category. JS
is used to show/hide the extra fields when the category dropdown is changed.

A consequence of the implementation is that any extra metadata from the original
category is lost when the category is changed. Some thought was given to storing
the old values elsewhere in the problem's extra field but I decided against this
for the time being.

For mysociety/fixmystreetforcouncils#45

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