UK. Generic problems_clause for two-tier councils

Replace copy-pasted problems_cause declarations in Hart,
Oxfordshire, and East Sussex with a generic override in
UKCouncils.pm (as a bonus also overrides Stevenage)
Merge branch 'issues/commercial/603/generic-problems-clause-for-two-tier'
Minimally viable Warwickshire cobrand
Untouched Warwickshire header and footer files
Use Warwickshire colours for page elements
Include FMS elements in header

The includes FMS CSS & JS, and adding the FMS navigation to the page
Use correct Warwickshire colours on map
Use full-screen map on desktop.
Improve display of homepage elements
Ensure correct classes are added to body tag
Make sure site header has correct height on front page
Tidy-up of unused header content and wrappers
Improve display of map
Position map beneath other elements
Improve map display
Restore original header class to ensure width is set correctly
Take some CSS from Warwickshire styles to ensure its applied
Fix container widths on map page
Make sure map wrapper is the correct width
Add style overrides to match  Warwickshire.gov.uk