Adds ability to have inline radio buttons using the fieldset.inline
functionality from gov.uk elements.
Then implements this for the radio buttons for choosing postage
class.
Also overrides the gov uk elements styling for the inline radio
buttons to place them slightly closer together as this looks
better.
Live regions need to be in the original HTML of
the page to work. We were generating the summary
in JS.
This changes the JS to only generate the contents
of the summary so changes to its contents are
announces by the existing live-region.
Expands the API of the macro to allow nested
checkboxes to have a summary tracking the current
selection, the fieldset to expand/collapse and
buttons to be added to allow jumping between
states.
Includes making 'Done' button inline on mobile.
Helps differentiate it form the form submit.
For the template folders permission editing we need a nested
checkboxes form that is similar to "move folder" input, except
it's using checkboxes instead of radio buttons.
This moves most of the macros into a shared "select-input" components
file, which are wrapped by the existing radios.html by setting the
required input type.
